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annotate packages/hal/arm/arch/current/src/hal_syscall.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17

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Merge from eCos master repository on 2000-11-17-18:24:25-GMT
author jlarmour
date Fri, 17 Nov 2000 23:16:43 +0000
parents
children e0c0827131d1
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1 //=============================================================================
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2 //
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3 // hal_syscall.c
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4 //
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5 //
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6 //
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7 //=============================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //=============================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): msalter
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35 // Contributors:msalter
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36 // Date: 2000-11-5
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37 // Purpose:
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38 // Description:
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39 //
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40 //
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //=============================================================================
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45
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46 #include <pkgconf/hal.h>
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47
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48 #ifdef CYGPKG_REDBOOT
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49 #include <pkgconf/redboot.h>
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50 #endif
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51
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52 #if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)
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53
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54 #include <cyg/hal/hal_stub.h> // Our header
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55 #include <cyg/hal/hal_arch.h> // HAL_BREAKINST
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56 #include <cyg/hal/hal_cache.h> // HAL_xCACHE_x
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57 #include <cyg/hal/hal_intr.h> // interrupt disable/restore
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58
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59 #include <cyg/hal/hal_if.h> // ROM calling interface
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60 #include <cyg/hal/hal_misc.h> // Helper functions
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61
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62 extern int __do_syscall(int func, // syscall function number
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63 long arg1, long arg2, // up to four args.
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64 long arg3, long arg4,
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65 int *retval); // syscall return value
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66
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67 #define SYS_exit 1
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68 #define SYS_interrupt 1000
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69
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70 int
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71 hal_syscall_handler(void)
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72 {
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73 int func, arg1, arg2, arg3, arg4;
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74 int err;
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75
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76 #if 0
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77 union arm_insn inst;
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78
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79 // What is the instruction we were executing
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80 //
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81 inst.word = *(unsigned long *)(regs->_pc - ARM_INST_SIZE);
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82
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83 // Not a syscall. Don't handle it
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84 if ((inst.swi.rsv1 != SWI_RSV1_VALUE) || (inst.swi.swi_number != SYSCALL_SWI))
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85 return 0;
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86 #endif
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87
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88 func = get_register(R0);
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89 arg1 = get_register(R1);
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90 arg2 = get_register(R2);
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91 arg3 = get_register(R3);
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92 arg4 = *(unsigned int *)(get_register(SP) + 4);
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93
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94 if ((get_register(PS) & CPSR_MODE_BITS) == CPSR_SUPERVISOR_MODE)
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95 put_register(PC, get_register(IP));
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96 else
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97 put_register(PC, get_register(LR));
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98
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99 if (func == SYS_exit) {
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100 // We want to stop in exit so that the user may poke around
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101 // to see why his app exited.
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102 return SIGTRAP;
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103 }
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104
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105 if (func == SYS_interrupt) {
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106 // A console interrupt landed us here.
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107 // Invoke the debug agent so as to cause a SIGINT.
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108 return SIGINT;
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109 }
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110
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111 if (__do_syscall(func, arg1, arg2, arg3, arg4, &err)) {
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112 put_register(R0, err);
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113 return 0;
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114 }
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115
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116 return SIGTRAP;
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117 }
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118
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119 #endif // CYGSEM_REDBOOT_BSP_SYSCALLS