Mercurial > ecos
annotate packages/hal/common/current/src/hal_stub.c @ 1655:ca8bb447fe5f
* src/hal_stub.c:
(cyg_hal_gdb_interrupt)
(cyg_hal_gdb_remove_break): Changed both to use
_read_mem_safe/__write_mem_safe for inserting a breakpoint, and
restoring the original instruction.
The Xtensa architecture (and others maybe?) can have unaligned
instructions, which caused unaligned load/store exception.
| author | jlarmour |
|---|---|
| date | Thu, 27 May 2004 05:47:40 +0000 |
| parents | 609c8b1447ee |
| children | 74dbf4c3f2e1 |
| rev | line source |
|---|---|
| 2 | 1 //============================================================================= |
| 2 // | |
| 3 // hal_stub.c | |
| 4 // | |
| 5 // Helper functions for stub, specific to eCos HAL | |
| 6 // | |
| 7 //============================================================================= | |
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8 //####ECOSGPLCOPYRIGHTBEGIN#### |
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9 // ------------------------------------------- |
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10 // This file is part of eCos, the Embedded Configurable Operating System. |
| 1002 | 11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc. |
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12 // |
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13 // eCos is free software; you can redistribute it and/or modify it under |
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14 // the terms of the GNU General Public License as published by the Free |
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15 // Software Foundation; either version 2 or (at your option) any later version. |
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16 // |
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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20 // for more details. |
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21 // |
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22 // You should have received a copy of the GNU General Public License along |
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23 // with eCos; if not, write to the Free Software Foundation, Inc., |
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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25 // |
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26 // As a special exception, if other files instantiate templates or use macros |
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27 // or inline functions from this file, or you compile this file and link it |
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28 // with other works to produce a work based on this file, this file does not |
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29 // by itself cause the resulting work to be covered by the GNU General Public |
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30 // License. However the source code for this file must still be made available |
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31 // in accordance with section (3) of the GNU General Public License. |
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32 // |
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33 // This exception does not invalidate any other reasons why a work based on |
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34 // this file might be covered by the GNU General Public License. |
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35 // |
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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37 // at http://sources.redhat.com/ecos/ecos-license/ |
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38 // ------------------------------------------- |
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39 //####ECOSGPLCOPYRIGHTEND#### |
| 2 | 40 //============================================================================= |
| 41 //#####DESCRIPTIONBEGIN#### | |
| 42 // | |
| 43 // Author(s): jskov (based on powerpc/cogent hal_stub.c) | |
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44 // Contributors:jskov, dmoseley |
| 2 | 45 // Date: 1999-02-12 |
| 46 // Purpose: Helper functions for stub, specific to eCos HAL | |
| 47 // Description: Parts of the GDB stub requirements are provided by | |
| 48 // the eCos HAL, rather than target and/or board specific | |
| 49 // code. | |
| 50 // | |
| 51 //####DESCRIPTIONEND#### | |
| 52 // | |
| 53 //============================================================================= | |
| 54 | |
| 55 #include <pkgconf/hal.h> | |
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56 #ifdef CYGPKG_CYGMON |
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57 #include <pkgconf/cygmon.h> |
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58 #endif |
| 2 | 59 |
| 60 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS | |
| 61 | |
| 62 #include <cyg/hal/hal_stub.h> // Our header | |
| 63 | |
| 64 #include <cyg/hal/hal_arch.h> // HAL_BREAKINST | |
| 65 #include <cyg/hal/hal_cache.h> // HAL_xCACHE_x | |
| 66 #include <cyg/hal/hal_intr.h> // interrupt disable/restore | |
| 67 | |
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68 #include <cyg/hal/hal_if.h> // ROM calling interface |
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69 #include <cyg/hal/hal_misc.h> // Helper functions |
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70 |
| 2 | 71 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT |
| 72 #include <cyg/hal/dbg-threads-api.h> // dbg_currthread_id | |
| 73 #endif | |
| 74 | |
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75 #ifdef USE_LONG_NAMES_FOR_ENUM_REGNAMES |
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76 #ifndef PC |
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77 #define PC REG_PC |
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78 #endif |
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79 #ifndef SP |
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80 #define SP REG_SP |
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81 #endif |
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82 #endif |
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83 |
| 2 | 84 //----------------------------------------------------------------------------- |
| 85 // Extra eCos data. | |
| 86 | |
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87 // Some architectures use registers of different sizes, so NUMREGS |
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88 // alone is not suffucient to size the register save area. For those |
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89 // architectures, HAL_STUB_REGISTERS_SIZE is defined as the number |
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90 // of target_register_t sized elements in the register save area. |
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91 #ifndef HAL_STUB_REGISTERS_SIZE |
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92 #define HAL_STUB_REGISTERS_SIZE NUMREGS |
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93 #endif |
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94 |
| 2 | 95 // Saved registers. |
| 96 HAL_SavedRegisters *_hal_registers; | |
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97 target_register_t registers[HAL_STUB_REGISTERS_SIZE]; |
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98 target_register_t alt_registers[HAL_STUB_REGISTERS_SIZE] ; // Thread or saved process state |
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99 target_register_t * _registers = registers; // Pointer to current set of registers |
| 1002 | 100 #ifndef CYGPKG_REDBOOT |
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101 target_register_t orig_registers[HAL_STUB_REGISTERS_SIZE]; // Registers to get back to original state |
| 1002 | 102 #endif |
| 2 | 103 |
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104 #if defined(HAL_STUB_HW_WATCHPOINT) || defined(HAL_STUB_HW_BREAKPOINT) |
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105 static int _hw_stop_reason; // Reason we were stopped by hw. |
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106 |
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107 //#define HAL_STUB_HW_SEND_STOP_REASON_TEXT |
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108 #ifdef CYGINT_HAL_ARM_ARCH_XSCALE |
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109 #define HAL_STUB_HW_SEND_STOP_REASON_TEXT |
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110 #endif |
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111 |
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112 #ifdef HAL_STUB_HW_SEND_STOP_REASON_TEXT |
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113 // strings indexed by hw stop reasons defined in hal_stub.h |
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114 |
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115 // Not all GDBs understand this. |
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116 static const char * const _hw_stop_str[] = { |
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117 "", |
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118 "hbreak", |
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119 "watch", |
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120 "rwatch", |
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121 "awatch" |
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122 }; |
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123 #endif // HAL_STUB_HW_SEND_STOP_REASON_TEXT |
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124 |
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125 static void *_watch_data_addr; // The data address if stopped by watchpoint |
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126 #endif // defined(HAL_STUB_HW_WATCHPOINT) || defined(HAL_STUB_HW_BREAKPOINT) |
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127 |
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128 // Register validity checking |
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129 #ifdef CYGHWR_REGISTER_VALIDITY_CHECKING |
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130 int registers_valid[NUMREGS]; |
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131 int *_registers_valid = registers_valid; |
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132 #endif |
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133 |
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134 #ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT // this should go away |
| 2 | 135 // Interrupt control. |
| 136 static volatile __PFI __interruptible_control; | |
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137 #endif |
| 2 | 138 |
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139 // Some architectures need extras regs reported in T packet |
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140 #ifndef HAL_STUB_ARCH_T_PACKET_EXTRAS |
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141 #define HAL_STUB_ARCH_T_PACKET_EXTRAS(x) |
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142 #endif |
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143 |
| 2 | 144 //----------------------------------------------------------------------------- |
| 145 // Register access | |
| 146 | |
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147 #ifndef CYGARC_STUB_REGISTER_ACCESS_DEFINED |
| 2 | 148 // Return the currently-saved value corresponding to register REG of |
| 149 // the exception context. | |
| 150 target_register_t | |
| 151 get_register (regnames_t reg) | |
| 152 { | |
| 153 return _registers[reg]; | |
| 154 } | |
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155 #endif |
| 2 | 156 |
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157 #ifdef CYGHWR_REGISTER_VALIDITY_CHECKING |
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158 // Return the validity of register REG. |
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159 int |
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160 get_register_valid (regnames_t reg) |
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161 { |
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162 return _registers_valid[reg]; |
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163 } |
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164 #endif |
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165 |
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166 #ifndef CYGARC_STUB_REGISTER_ACCESS_DEFINED |
| 2 | 167 // Store VALUE in the register corresponding to WHICH in the exception |
| 168 // context. | |
| 169 void | |
| 170 put_register (regnames_t which, target_register_t value) | |
| 171 { | |
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172 #ifdef CYGPKG_HAL_MIPS_VR4300 |
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173 // This is a rather nasty kludge to compensate for the fact that |
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174 // the VR4300 GDB is rather old and does not support proper 64 bit |
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175 // registers. The only time this really matters is when setting |
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176 // the PC after loading an executable. So here we detect this case |
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177 // and artificially sign extend it. |
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178 |
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179 if( which == PC && (value & 0x0000000080000000ULL ) ) |
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180 { |
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181 value |= 0xFFFFFFFF00000000ULL; |
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182 } |
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183 #endif |
| 2 | 184 _registers[which] = value; |
| 185 } | |
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186 #endif // CYGARC_STUB_REGISTER_ACCESS_DEFINED |
| 2 | 187 |
| 188 //----------------------------------------------------------------------------- | |
| 189 // Serial stuff | |
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190 #ifdef CYGPKG_CYGMON |
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191 extern void ecos_bsp_console_putc(char); |
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192 extern char ecos_bsp_console_getc(void); |
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193 #endif |
| 2 | 194 |
| 195 // Write C to the current serial port. | |
| 196 void | |
| 197 putDebugChar (int c) | |
| 198 { | |
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199 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT |
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200 __call_if_debug_procs_t __debug_procs = CYGACC_CALL_IF_DEBUG_PROCS(); |
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201 CYGACC_COMM_IF_PUTC(*__debug_procs, c); |
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202 #elif defined(CYGPKG_CYGMON) |
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203 ecos_bsp_console_putc(c); |
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204 #else |
| 2 | 205 HAL_STUB_PLATFORM_PUT_CHAR(c); |
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206 #endif |
| 2 | 207 } |
| 208 | |
| 209 // Read one character from the current serial port. | |
| 210 int | |
| 211 getDebugChar (void) | |
| 212 { | |
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213 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT |
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214 __call_if_debug_procs_t __debug_procs = CYGACC_CALL_IF_DEBUG_PROCS(); |
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215 return CYGACC_COMM_IF_GETC(*__debug_procs); |
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216 #elif defined(CYGPKG_CYGMON) |
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217 return ecos_bsp_console_getc(); |
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218 #else |
| 2 | 219 return HAL_STUB_PLATFORM_GET_CHAR(); |
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220 #endif |
| 2 | 221 } |
| 222 | |
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223 // Flush output channel |
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224 void |
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225 hal_flush_output(void) |
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226 { |
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227 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT |
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228 __call_if_debug_procs_t __debug_procs = CYGACC_CALL_IF_DEBUG_PROCS(); |
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229 CYGACC_COMM_IF_CONTROL(*__debug_procs, __COMMCTL_FLUSH_OUTPUT); |
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230 #endif |
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231 } |
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232 |
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233 |
| 2 | 234 // Set the baud rate for the current serial port. |
| 235 void | |
| 236 __set_baud_rate (int baud) | |
| 237 { | |
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238 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT |
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239 __call_if_debug_procs_t __debug_procs = CYGACC_CALL_IF_DEBUG_PROCS(); |
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240 CYGACC_COMM_IF_CONTROL(*__debug_procs, __COMMCTL_SETBAUD, baud); |
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241 #elif defined(CYGPKG_CYGMON) |
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242 // FIXME! |
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243 #else |
| 2 | 244 HAL_STUB_PLATFORM_SET_BAUD_RATE(baud); |
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245 #endif |
| 2 | 246 } |
| 247 | |
| 248 //----------------------------------------------------------------------------- | |
| 249 // GDB interrupt (BREAK) support. | |
| 250 | |
| 251 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 252 | |
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253 #ifndef CYGPKG_HAL_ARM |
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254 |
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255 #if (HAL_BREAKINST_SIZE == 1) |
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256 typedef cyg_uint8 t_inst; |
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257 #elif (HAL_BREAKINST_SIZE == 2) |
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258 typedef cyg_uint16 t_inst; |
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259 #elif (HAL_BREAKINST_SIZE == 4) |
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260 typedef cyg_uint32 t_inst; |
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261 #else |
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262 #error "Don't know how to handle that size" |
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263 #endif |
| 2 | 264 |
| 265 typedef struct | |
| 266 { | |
| 267 t_inst *targetAddr; | |
| 268 t_inst savedInstr; | |
| 269 } instrBuffer; | |
| 270 | |
| 271 static instrBuffer break_buffer; | |
| 272 | |
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273 volatile int cyg_hal_gdb_running_step = 0; |
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274 |
| 2 | 275 void |
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276 cyg_hal_gdb_place_break (target_register_t pc) |
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277 { |
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278 cyg_hal_gdb_interrupt( pc ); // Let's hope this becomes a drop-through: |
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279 } |
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280 |
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281 void |
| 2 | 282 cyg_hal_gdb_interrupt (target_register_t pc) |
| 283 { | |
| 1655 | 284 t_inst break_inst = HAL_BREAKINST; |
| 285 | |
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286 CYGARC_HAL_SAVE_GP(); |
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287 |
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288 // Clear flag that we Continued instead of Stepping |
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289 cyg_hal_gdb_running_step = 0; |
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290 // and override existing break? So that a ^C takes effect... |
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291 if (NULL != break_buffer.targetAddr) |
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292 cyg_hal_gdb_remove_break( (target_register_t)break_buffer.targetAddr ); |
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293 |
| 2 | 294 if (NULL == break_buffer.targetAddr) { |
| 1655 | 295 // Not always safe to read/write directly to program |
| 296 // memory due to possibly unaligned instruction, use the | |
| 297 // provided memory functions instead. | |
| 298 __read_mem_safe(&break_buffer.savedInstr, (t_inst*)pc, HAL_BREAKINST_SIZE); | |
| 299 __write_mem_safe(&break_inst, (t_inst*)pc, HAL_BREAKINST_SIZE); | |
| 300 | |
| 301 // Save the PC where we put the break, so we can remove | |
| 302 // it after the target takes the break. | |
| 303 break_buffer.targetAddr = (t_inst*)pc; | |
| 2 | 304 |
| 305 __data_cache(CACHE_FLUSH); | |
| 306 __instruction_cache(CACHE_FLUSH); | |
| 307 } | |
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308 |
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309 CYGARC_HAL_RESTORE_GP(); |
| 2 | 310 } |
| 311 | |
| 312 int | |
| 313 cyg_hal_gdb_remove_break (target_register_t pc) | |
| 314 { | |
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315 if ( cyg_hal_gdb_running_step ) |
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316 return 0; |
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317 |
| 2 | 318 if ((t_inst*)pc == break_buffer.targetAddr) { |
| 1655 | 319 |
| 320 __write_mem_safe(&break_buffer.savedInstr, (t_inst*)pc, HAL_BREAKINST_SIZE); | |
| 2 | 321 break_buffer.targetAddr = NULL; |
| 322 | |
| 323 __data_cache(CACHE_FLUSH); | |
| 324 __instruction_cache(CACHE_FLUSH); | |
| 325 return 1; | |
| 326 } | |
| 327 return 0; | |
| 328 } | |
| 329 | |
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330 int |
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331 cyg_hal_gdb_break_is_set (void) |
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332 { |
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333 if (NULL != break_buffer.targetAddr) { |
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334 return 1; |
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335 } |
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336 return 0; |
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337 } |
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338 |
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339 #endif // CYGPKG_HAL_ARM |
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340 |
| 2 | 341 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
| 342 | |
| 343 // Use this function to disable serial interrupts whenever reply | |
| 344 // characters are expected from GDB. The reason we want to control | |
| 345 // whether the target can be interrupted or not is simply that GDB on | |
| 346 // the host will be sending acknowledge characters/commands while the | |
| 347 // stub is running - if serial interrupts were still active, the | |
| 348 // characters would never reach the (polling) getDebugChar. | |
| 349 static void | |
| 350 interruptible(int state) | |
| 351 { | |
| 352 static int __interrupts_suspended = 0; | |
| 353 | |
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354 if (state) { |
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355 __interrupts_suspended--; |
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356 if (0 >= __interrupts_suspended) { |
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357 __interrupts_suspended = 0; |
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358 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT // this _check_ should go away |
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359 { |
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360 hal_virtual_comm_table_t* __chan; |
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361 __chan = CYGACC_CALL_IF_DEBUG_PROCS(); |
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362 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE); |
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363 } |
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364 #else |
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365 if (__interruptible_control) |
| 2 | 366 __interruptible_control(1); |
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367 #endif |
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368 } |
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369 } else { |
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370 __interrupts_suspended++; |
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371 if (1 == __interrupts_suspended) |
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372 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT // this _check_ should go away |
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373 { |
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374 hal_virtual_comm_table_t* __chan; |
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375 __chan = CYGACC_CALL_IF_DEBUG_PROCS(); |
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376 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE); |
| 2 | 377 } |
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378 #else |
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379 if (__interruptible_control) |
| 2 | 380 __interruptible_control(0); |
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381 #endif |
| 2 | 382 } |
| 383 } | |
| 384 | |
| 385 //----------------------------------------------------------------------------- | |
| 386 // eCos stub entry and exit magic. | |
| 387 | |
| 388 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 389 int cyg_hal_gdb_break; | |
| 390 #endif | |
| 391 | |
| 1002 | 392 #ifdef CYGPKG_REDBOOT |
| 393 // Trampoline for returning to RedBoot from exception/stub code | |
| 394 static void | |
| 395 return_from_stub(int exit_status) | |
| 396 { | |
| 397 CYGACC_CALL_IF_MONITOR_RETURN(exit_status); | |
| 398 } | |
| 399 #endif | |
| 400 | |
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401 // Called at stub *kill* |
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402 static void |
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403 handle_exception_exit( void ) |
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404 { |
| 1002 | 405 #ifdef CYGPKG_REDBOOT |
| 406 #ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF | |
| 407 { // Reset the timer to default and cancel any callback | |
| 408 extern void sys_profile_reset(void); | |
| 409 sys_profile_reset(); | |
| 410 } | |
| 411 #endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF | |
| 412 set_pc((target_register_t)return_from_stub); | |
| 413 #else | |
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414 int i; |
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415 |
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416 for (i = 0; i < (sizeof(registers)/sizeof(registers[0])); i++) |
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417 registers[i] = orig_registers[i]; |
| 1002 | 418 #endif |
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419 } |
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420 |
| 2 | 421 // Called at stub *entry* |
| 422 static void | |
| 423 handle_exception_cleanup( void ) | |
| 424 { | |
| 1002 | 425 #ifndef CYGPKG_REDBOOT |
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426 static int orig_registers_set = 0; |
| 1002 | 427 #endif |
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428 |
| 2 | 429 interruptible(0); |
| 430 | |
| 431 // Expand the HAL_SavedRegisters structure into the GDB register | |
| 432 // array format. | |
| 433 HAL_GET_GDB_REGISTERS(®isters[0], _hal_registers); | |
| 434 _registers = ®isters[0]; | |
| 435 | |
| 1002 | 436 #ifndef CYGPKG_REDBOOT |
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437 if (!orig_registers_set) { |
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438 int i; |
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439 for (i = 0; i < (sizeof(registers)/sizeof(registers[0])); i++) |
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440 orig_registers[i] = registers[i]; |
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441 _registers = &orig_registers[0]; |
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442 if (__is_breakpoint_function ()) |
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443 __skipinst (); |
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444 _registers = ®isters[0]; |
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445 orig_registers_set = 1; |
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446 } |
| 1002 | 447 #endif |
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448 |
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449 #ifdef HAL_STUB_PLATFORM_STUBS_FIXUP |
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450 // Some architectures may need to fix the PC in case of a partial |
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451 // or fully executed trap instruction. GDB only takes correct action |
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452 // when the PC is pointing to the breakpoint instruction it set. |
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453 // |
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454 // Most architectures would leave PC pointing at the trap |
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455 // instruction itself though, and so do not need to do anything |
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456 // special. |
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457 HAL_STUB_PLATFORM_STUBS_FIXUP(); |
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458 #endif |
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459 |
| 2 | 460 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
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461 // If we continued instead of stepping, when there was a break set |
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462 // ie. we were stepping within a critical region, clear the break, and |
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463 // that flag. If we stopped for some other reason, this has no effect. |
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464 if ( cyg_hal_gdb_running_step ) { |
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465 cyg_hal_gdb_running_step = 0; |
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466 cyg_hal_gdb_remove_break(get_register (PC)); |
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467 } |
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468 |
| 2 | 469 // FIXME: (there may be a better way to do this) |
| 470 // If we hit a breakpoint set by the gdb interrupt stub, make it | |
| 471 // seem like an interrupt rather than having hit a breakpoint. | |
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472 cyg_hal_gdb_break = cyg_hal_gdb_remove_break(get_register (PC)); |
| 2 | 473 #endif |
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474 |
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475 #if defined(HAL_STUB_HW_WATCHPOINT) || defined(HAL_STUB_HW_BREAKPOINT) |
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476 // For HW watchpoint/breakpoint support, we need to know if we |
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477 // stopped because of watchpoint or hw break. We do that here |
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478 // before GDB has a chance to remove the watchpoints and save |
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479 // the information for later use in building response packets. |
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480 _hw_stop_reason = HAL_STUB_IS_STOPPED_BY_HARDWARE(_watch_data_addr); |
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481 #endif |
| 2 | 482 } |
| 483 | |
| 484 // Called at stub *exit* | |
| 485 static void | |
| 486 handle_exception_init( void ) | |
| 487 { | |
| 488 // Compact register array again. | |
| 489 HAL_SET_GDB_REGISTERS(_hal_registers, ®isters[0]); | |
| 490 | |
| 491 interruptible(1); | |
| 492 } | |
| 493 | |
| 494 | |
| 495 //----------------------------------------------------------------------------- | |
| 496 // Initialization. | |
| 497 | |
| 498 // Signal handler. | |
| 499 int | |
| 500 cyg_hal_process_signal (int signal) | |
| 501 { | |
| 502 // We don't care about the signal (atm). | |
| 503 return 0; | |
| 504 } | |
| 505 | |
| 506 // Install the standard set of trap handlers for the stub. | |
| 507 void | |
| 508 __install_traps (void) | |
| 509 { | |
| 510 // Set signal handling vector so we can treat 'C<signum>' as 'c'. | |
| 511 __process_signal_vec = &cyg_hal_process_signal; | |
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512 __process_exit_vec = &handle_exception_exit; |
| 2 | 513 |
| 514 __cleanup_vec = &handle_exception_cleanup; | |
| 515 __init_vec = &handle_exception_init; | |
| 516 | |
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517 #ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT // this should go away |
| 2 | 518 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
| 519 // Control of GDB interrupts. | |
| 520 __interruptible_control = HAL_STUB_PLATFORM_INTERRUPTIBLE; | |
| 521 #endif | |
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522 #endif |
| 2 | 523 |
| 524 // Nothing further to do, handle_exception will be called when an | |
| 525 // exception occurs. | |
| 526 } | |
| 527 | |
| 528 // Initialize the hardware. | |
| 529 void | |
| 530 initHardware (void) | |
| 531 { | |
| 532 static int initialized = 0; | |
| 533 | |
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534 if (initialized) |
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535 return; |
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536 initialized = 1; |
| 2 | 537 |
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538 // Get serial port initialized. |
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539 HAL_STUB_PLATFORM_INIT_SERIAL(); |
| 2 | 540 |
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541 #ifdef HAL_STUB_PLATFORM_INIT |
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542 // If the platform defines any initialization code, call it here. |
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543 HAL_STUB_PLATFORM_INIT(); |
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544 #endif |
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545 |
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546 #ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT // this should go away |
| 2 | 547 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
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548 // Get interrupt handler initialized. |
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549 HAL_STUB_PLATFORM_INIT_BREAK_IRQ(); |
| 2 | 550 #endif |
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551 #endif // !CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT |
| 2 | 552 } |
| 553 | |
| 554 // Reset the board. | |
| 555 void | |
| 556 __reset (void) | |
| 557 { | |
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558 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT |
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559 __call_if_reset_t *__rom_reset = CYGACC_CALL_IF_RESET_GET(); |
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560 if (__rom_reset) |
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561 (*__rom_reset)(); |
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562 #else |
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563 HAL_PLATFORM_RESET(); |
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564 #endif |
| 2 | 565 } |
| 566 | |
| 567 //----------------------------------------------------------------------------- | |
| 568 // Breakpoint support. | |
| 569 | |
| 570 #ifndef CYGPKG_HAL_ARM | |
| 571 // This function will generate a breakpoint exception. It is used at | |
| 572 // the beginning of a program to sync up with a debugger and can be | |
| 573 // used otherwise as a quick means to stop program execution and | |
| 574 // "break" into the debugger. | |
| 575 void | |
| 576 breakpoint() | |
| 577 { | |
| 578 HAL_BREAKPOINT(_breakinst); | |
| 579 } | |
| 580 | |
| 581 // This function returns the opcode for a 'trap' instruction. | |
| 582 unsigned long | |
| 583 __break_opcode () | |
| 584 { | |
| 585 return HAL_BREAKINST; | |
| 586 } | |
| 587 #endif | |
| 588 | |
| 589 //----------------------------------------------------------------------------- | |
| 590 // Write the 'T' packet in BUFFER. SIGVAL is the signal the program received. | |
| 591 void | |
| 592 __build_t_packet (int sigval, char *buf) | |
| 593 { | |
| 594 target_register_t addr; | |
| 595 char *ptr = buf; | |
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596 target_register_t extend_val = 0; |
| 2 | 597 |
| 598 *ptr++ = 'T'; | |
| 599 *ptr++ = __tohex (sigval >> 4); | |
| 600 *ptr++ = __tohex (sigval); | |
| 601 | |
| 602 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT | |
| 603 // Include thread ID if thread manipulation is required. | |
| 604 { | |
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605 int id = dbg_currthread_id (); |
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606 |
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607 if (id != 0) { |
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608 *ptr++ = 't'; |
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609 *ptr++ = 'h'; |
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610 *ptr++ = 'r'; |
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611 *ptr++ = 'e'; |
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612 *ptr++ = 'a'; |
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613 *ptr++ = 'd'; |
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614 *ptr++ = ':'; |
| 2 | 615 |
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616 #if (CYG_BYTEORDER == CYG_LSBFIRST) |
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617 // FIXME: Temporary workaround for PR 18903. Thread ID must be |
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618 // big-endian in the T packet. |
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619 { |
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620 unsigned char* bep = (unsigned char*)&id; |
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621 int be_id; |
| 2 | 622 |
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623 be_id = id; |
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624 *bep++ = (be_id >> 24) & 0xff ; |
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625 *bep++ = (be_id >> 16) & 0xff ; |
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626 *bep++ = (be_id >> 8) & 0xff ; |
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627 *bep++ = (be_id & 0xff) ; |
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628 } |
| 2 | 629 #endif |
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630 ptr = __mem2hex((char *)&id, ptr, sizeof(id), 0); |
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631 *ptr++ = ';'; |
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632 } |
| 2 | 633 } |
| 634 #endif | |
| 635 | |
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636 #ifdef HAL_STUB_HW_WATCHPOINT |
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637 switch(_hw_stop_reason) { |
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638 case HAL_STUB_HW_STOP_WATCH: |
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639 case HAL_STUB_HW_STOP_RWATCH: |
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640 case HAL_STUB_HW_STOP_AWATCH: |
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641 #ifdef HAL_STUB_HW_SEND_STOP_REASON_TEXT |
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642 // Not all GDBs understand this. |
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643 strcpy(ptr, _hw_stop_str[_hw_stop_reason]); |
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644 ptr += strlen(_hw_stop_str[_hw_stop_reason]); |
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645 #endif |
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646 *ptr++ = ':'; |
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647 // Send address MSB first |
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648 ptr += __intToHex(ptr, (target_register_t)_watch_data_addr, |
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649 sizeof(_watch_data_addr) * 8); |
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650 *ptr++ = ';'; |
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651 break; |
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652 default: |
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653 break; |
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654 } |
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655 #endif |
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656 |
| 2 | 657 *ptr++ = __tohex (PC >> 4); |
| 658 *ptr++ = __tohex (PC); | |
| 659 *ptr++ = ':'; | |
| 660 addr = get_register (PC); | |
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661 if (sizeof(addr) < REGSIZE(PC)) |
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662 { |
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663 // GDB is expecting REGSIZE(PC) number of bytes. |
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664 // We only have sizeof(addr) number. Let's fill |
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665 // the appropriate number of bytes intelligently. |
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666 #ifdef CYGARC_SIGN_EXTEND_REGISTERS |
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667 { |
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668 unsigned long bits_in_addr = (sizeof(addr) << 3); // ie Size in bytes * 8 |
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669 target_register_t sign_bit_mask = (1 << (bits_in_addr - 1)); |
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670 if ((addr & sign_bit_mask) == sign_bit_mask) |
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671 extend_val = ~0; |
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672 } |
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673 #endif |
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674 } |
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675 #if (CYG_BYTEORDER == CYG_MSBFIRST) |
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676 ptr = __mem2hex((char *)&extend_val, ptr, REGSIZE(PC) - sizeof(addr), 0); |
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677 #endif |
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678 ptr = __mem2hex((char *)&addr, ptr, sizeof(addr), 0); |
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679 #if (CYG_BYTEORDER == CYG_LSBFIRST) |
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680 ptr = __mem2hex((char *)&extend_val, ptr, REGSIZE(PC) - sizeof(addr), 0); |
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681 #endif |
| 2 | 682 *ptr++ = ';'; |
| 683 | |
| 684 *ptr++ = __tohex (SP >> 4); | |
| 685 *ptr++ = __tohex (SP); | |
| 686 *ptr++ = ':'; | |
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687 addr = (target_register_t) get_register (SP); |
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688 if (sizeof(addr) < REGSIZE(SP)) |
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689 { |
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690 // GDB is expecting REGSIZE(SP) number of bytes. |
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691 // We only have sizeof(addr) number. Let's fill |
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692 // the appropriate number of bytes intelligently. |
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693 extend_val = 0; |
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694 #ifdef CYGARC_SIGN_EXTEND_REGISTERS |
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695 { |
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696 unsigned long bits_in_addr = (sizeof(addr) << 3); // ie Size in bytes * 8 |
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697 target_register_t sign_bit_mask = (1 << (bits_in_addr - 1)); |
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698 if ((addr & sign_bit_mask) == sign_bit_mask) |
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699 extend_val = ~0; |
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700 } |
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701 #endif |
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702 ptr = __mem2hex((char *)&extend_val, ptr, REGSIZE(SP) - sizeof(addr), 0); |
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703 } |
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704 ptr = __mem2hex((char *)&addr, ptr, sizeof(addr), 0); |
| 2 | 705 *ptr++ = ';'; |
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706 |
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707 HAL_STUB_ARCH_T_PACKET_EXTRAS(ptr); |
| 2 | 708 |
| 709 *ptr++ = 0; | |
| 710 } | |
| 711 | |
| 712 | |
| 713 //----------------------------------------------------------------------------- | |
| 714 // Cache functions. | |
| 715 | |
| 716 // Perform the specified operation on the instruction cache. | |
| 717 // Returns 1 if the cache is enabled, 0 otherwise. | |
| 718 int | |
| 719 __instruction_cache (cache_control_t request) | |
| 720 { | |
| 721 int state = 1; | |
| 722 | |
| 723 switch (request) { | |
| 724 case CACHE_ENABLE: | |
| 725 HAL_ICACHE_ENABLE(); | |
| 726 break; | |
| 727 case CACHE_DISABLE: | |
| 728 HAL_ICACHE_DISABLE(); | |
| 729 state = 0; | |
| 730 break; | |
| 731 case CACHE_FLUSH: | |
| 732 HAL_ICACHE_SYNC(); | |
| 733 break; | |
| 734 case CACHE_NOOP: | |
| 735 /* fall through */ | |
| 736 default: | |
| 737 break; | |
| 738 } | |
| 739 | |
| 740 #ifdef HAL_ICACHE_IS_ENABLED | |
| 741 HAL_ICACHE_IS_ENABLED(state); | |
| 742 #endif | |
| 743 | |
| 744 return state; | |
| 745 } | |
| 746 | |
| 747 // Perform the specified operation on the data cache. | |
| 748 // Returns 1 if the cache is enabled, 0 otherwise. | |
| 749 int | |
| 750 __data_cache (cache_control_t request) | |
| 751 { | |
| 752 int state = 1; | |
| 753 | |
| 754 switch (request) { | |
| 755 case CACHE_ENABLE: | |
| 756 HAL_DCACHE_ENABLE(); | |
| 757 break; | |
| 758 case CACHE_DISABLE: | |
| 759 HAL_DCACHE_DISABLE(); | |
| 760 state = 0; | |
| 761 break; | |
| 762 case CACHE_FLUSH: | |
| 763 HAL_DCACHE_SYNC(); | |
| 764 break; | |
| 765 case CACHE_NOOP: | |
| 766 /* fall through */ | |
| 767 default: | |
| 768 break; | |
| 769 } | |
| 770 #ifdef HAL_DCACHE_IS_ENABLED | |
| 771 HAL_DCACHE_IS_ENABLED(state); | |
| 772 #endif | |
| 773 | |
| 774 return state; | |
| 775 } | |
| 776 | |
| 777 //----------------------------------------------------------------------------- | |
| 778 // Memory accessor functions. | |
| 779 | |
|
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780 // The __mem_fault_handler pointer is volatile since it is only |
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781 // set/cleared by the function below - which does not rely on any |
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782 // other functions, so the compiler may decide to not bother updating |
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783 // the pointer at all. If any of the memory accesses cause an |
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784 // exception, the pointer must be set to ensure the exception handler |
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785 // can make use of it. |
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786 |
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787 void* volatile __mem_fault_handler = (void *)0; |
| 2 | 788 |
| 789 /* These are the "arguments" to __do_read_mem and __do_write_mem, | |
| 790 which are passed as globals to avoid squeezing them thru | |
| 791 __set_mem_fault_trap. */ | |
| 792 | |
| 793 static volatile target_register_t memCount; | |
| 794 | |
| 795 static void | |
| 796 __do_copy_mem (unsigned char* src, unsigned char* dst) | |
| 797 { | |
|
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798 unsigned long *long_dst; |
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799 unsigned long *long_src; |
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800 unsigned short *short_dst; |
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801 unsigned short *short_src; |
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802 |
|
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803 // Zero memCount is not really an error, but the goto is necessary to |
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804 // keep some compilers from reordering stuff across the 'err' label. |
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805 if (memCount == 0) goto err; |
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806 |
|
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807 __mem_fault = 1; /* Defaults to 'fail'. Is cleared */ |
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808 /* when the copy loop completes. */ |
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809 __mem_fault_handler = &&err; |
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810 |
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811 // See if it's safe to do multi-byte, aligned operations |
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812 while (memCount) { |
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813 if ((memCount >= sizeof(long)) && |
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814 (((target_register_t)dst & (sizeof(long)-1)) == 0) && |
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815 (((target_register_t)src & (sizeof(long)-1)) == 0)) { |
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816 |
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817 long_dst = (unsigned long *)dst; |
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818 long_src = (unsigned long *)src; |
| 2 | 819 |
|
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820 *long_dst++ = *long_src++; |
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821 memCount -= sizeof(long); |
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822 |
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823 dst = (unsigned char *)long_dst; |
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824 src = (unsigned char *)long_src; |
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825 } else if ((memCount >= sizeof(short)) && |
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826 (((target_register_t)dst & (sizeof(short)-1)) == 0) && |
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827 (((target_register_t)src & (sizeof(short)-1)) == 0)) { |
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828 |
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829 short_dst = (unsigned short *)dst; |
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830 short_src = (unsigned short *)src; |
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831 |
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832 *short_dst++ = *short_src++; |
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833 memCount -= sizeof(short); |
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834 |
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835 dst = (unsigned char *)short_dst; |
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836 src = (unsigned char *)short_src; |
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837 } else { |
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838 *dst++ = *src++; |
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839 memCount--; |
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840 } |
| 2 | 841 } |
| 842 | |
|
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843 __mem_fault = 0; |
| 2 | 844 |
| 845 err: | |
|
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846 __mem_fault_handler = (void *)0; |
| 2 | 847 } |
| 848 | |
| 849 /* | |
| 850 * __read_mem_safe: | |
| 851 * Get contents of target memory, abort on error. | |
| 852 */ | |
| 853 | |
| 854 int | |
|
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855 __read_mem_safe (void *dst, void *src, int count) |
| 2 | 856 { |
|
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857 if( !CYG_HAL_STUB_PERMIT_DATA_READ( src, count ) ) |
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858 return 0; |
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859 |
| 2 | 860 memCount = count; |
| 861 __do_copy_mem((unsigned char*) src, (unsigned char*) dst); | |
| 862 return count - memCount; // return number of bytes successfully read | |
| 863 } | |
| 864 | |
| 865 /* | |
| 866 * __write_mem_safe: | |
| 867 * Set contents of target memory, abort on error. | |
| 868 */ | |
| 869 | |
| 870 int | |
|
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871 __write_mem_safe (void *src, void *dst, int count) |
| 2 | 872 { |
|
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873 if( !CYG_HAL_STUB_PERMIT_DATA_READ( dst, count ) ) |
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874 return 0; |
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875 |
| 2 | 876 memCount = count; |
| 877 __do_copy_mem((unsigned char*) src, (unsigned char*) dst); | |
| 878 return count - memCount; // return number of bytes successfully written | |
| 879 } | |
| 880 | |
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881 #ifdef TARGET_HAS_HARVARD_MEMORY |
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882 static void |
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883 __do_copy_from_progmem (unsigned char* src, unsigned char* dst) |
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884 { |
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885 unsigned long *long_dst; |
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886 unsigned long *long_src; |
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887 unsigned short *short_dst; |
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888 unsigned short *short_src; |
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889 |
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890 // Zero memCount is not really an error, but the goto is necessary to |
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891 // keep some compilers from reordering stuff across the 'err' label. |
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892 if (memCount == 0) goto err; |
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893 |
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894 __mem_fault = 1; /* Defaults to 'fail'. Is cleared */ |
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895 /* when the copy loop completes. */ |
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896 __mem_fault_handler = &&err; |
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897 |
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898 // See if it's safe to do multi-byte, aligned operations |
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899 while (memCount) { |
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900 if ((memCount >= sizeof(long)) && |
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901 (((target_register_t)dst & (sizeof(long)-1)) == 0) && |
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902 (((target_register_t)src & (sizeof(long)-1)) == 0)) { |
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903 |
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904 long_dst = (unsigned long *)dst; |
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905 long_src = (unsigned long *)src; |
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906 |
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907 *long_dst++ = __read_prog_uint32(long_src++); |
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908 memCount -= sizeof(long); |
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909 |
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910 dst = (unsigned char *)long_dst; |
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911 src = (unsigned char *)long_src; |
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912 } else if ((memCount >= sizeof(short)) && |
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913 (((target_register_t)dst & (sizeof(short)-1)) == 0) && |
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914 (((target_register_t)src & (sizeof(short)-1)) == 0)) { |
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915 |
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916 short_dst = (unsigned short *)dst; |
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917 short_src = (unsigned short *)src; |
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918 |
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919 *short_dst++ = __read_prog_uint16(short_src++); |
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920 memCount -= sizeof(short); |
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921 |
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922 dst = (unsigned char *)short_dst; |
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923 src = (unsigned char *)short_src; |
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924 } else { |
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925 *dst++ = __read_prog_uint8(src++); |
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926 memCount--; |
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927 } |
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928 } |
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929 |
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930 __mem_fault = 0; |
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931 |
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932 err: |
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933 __mem_fault_handler = (void *)0; |
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934 } |
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935 |
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936 static void |
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937 __do_copy_to_progmem (unsigned char* src, unsigned char* dst) |
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938 { |
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939 unsigned long *long_dst; |
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940 unsigned long *long_src; |
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941 unsigned short *short_dst; |
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942 unsigned short *short_src; |
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943 |
|
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944 // Zero memCount is not really an error, but the goto is necessary to |
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945 // keep some compilers from reordering stuff across the 'err' label. |
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946 if (memCount == 0) goto err; |
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947 |
|
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948 __mem_fault = 1; /* Defaults to 'fail'. Is cleared */ |
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949 /* when the copy loop completes. */ |
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950 __mem_fault_handler = &&err; |
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951 |
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952 // See if it's safe to do multi-byte, aligned operations |
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953 while (memCount) { |
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954 if ((memCount >= sizeof(long)) && |
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955 (((target_register_t)dst & (sizeof(long)-1)) == 0) && |
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956 (((target_register_t)src & (sizeof(long)-1)) == 0)) { |
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957 |
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958 long_dst = (unsigned long *)dst; |
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959 long_src = (unsigned long *)src; |
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960 |
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961 __write_prog_uint32(long_dst++, *long_src++); |
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962 memCount -= sizeof(long); |
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963 |
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964 dst = (unsigned char *)long_dst; |
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965 src = (unsigned char *)long_src; |
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966 } else if ((memCount >= sizeof(short)) && |
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967 (((target_register_t)dst & (sizeof(short)-1)) == 0) && |
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968 (((target_register_t)src & (sizeof(short)-1)) == 0)) { |
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969 |
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970 short_dst = (unsigned short *)dst; |
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971 short_src = (unsigned short *)src; |
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972 |
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973 __write_prog_uint16(short_dst++, *short_src++); |
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974 memCount -= sizeof(short); |
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975 |
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976 dst = (unsigned char *)short_dst; |
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977 src = (unsigned char *)short_src; |
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978 } else { |
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979 __write_prog_uint8(dst++, *src++); |
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980 memCount--; |
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981 } |
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982 } |
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983 |
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984 __mem_fault = 0; |
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985 |
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986 err: |
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987 __mem_fault_handler = (void *)0; |
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988 } |
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989 |
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990 /* |
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991 * __read_progmem_safe: |
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992 * Get contents of target memory, abort on error. |
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993 */ |
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994 |
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995 int |
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996 __read_progmem_safe (void *dst, void *src, int count) |
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997 { |
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998 if( !CYG_HAL_STUB_PERMIT_CODE_READ( src, count ) ) |
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999 return 0; |
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1000 |
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1001 memCount = count; |
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1002 __do_copy_from_progmem((unsigned char*) src, (unsigned char*) dst); |
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1003 return count - memCount; // return number of bytes successfully read |
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1004 } |
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1005 |
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1006 /* |
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1007 * __write_progmem_safe: |
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1008 * Set contents of target memory, abort on error. |
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1009 */ |
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1010 |
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1011 int |
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1012 __write_progmem_safe (void *src, void *dst, int count) |
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1013 { |
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1014 if( !CYG_HAL_STUB_PERMIT_CODE_WRITE( dst, count ) ) |
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1015 return 0; |
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1016 |
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1017 memCount = count; |
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1018 __do_copy_to_progmem((unsigned char*) src, (unsigned char*) dst); |
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1019 return count - memCount; // return number of bytes successfully written |
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1020 } |
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1021 #endif |
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1022 |
| 2 | 1023 //----------------------------------------------------------------------------- |
| 1024 // Target extras?! | |
| 1025 int | |
| 1026 __process_target_query(char * pkt, char * out, int maxOut) | |
| 1027 { return 0 ; } | |
| 1028 int | |
| 1029 __process_target_set(char * pkt, char * out, int maxout) | |
| 1030 { return 0 ; } | |
| 1031 int | |
| 1032 __process_target_packet(char * pkt, char * out, int maxout) | |
| 1033 { return 0 ; } | |
| 1034 | |
| 1035 // GDB string output, making sure interrupts are disabled. | |
| 1036 // This function gets used by some diag output functions. | |
| 1037 void | |
| 1038 hal_output_gdb_string(target_register_t str, int string_len) | |
| 1039 { | |
| 1040 unsigned long __state; | |
|
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1041 HAL_DISABLE_INTERRUPTS(__state); |
| 2 | 1042 __output_gdb_string(str, string_len); |
| 1043 HAL_RESTORE_INTERRUPTS(__state); | |
| 1044 } | |
| 1045 | |
| 1046 #endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS |