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* src/mcount.S: Add mcount functions for call-graph profiling. * cdl/hal_cortexm.cdl: Add option to build mcount functions. [ Bugzilla 1001954 ]
author jld
date Mon, 03 Mar 2014 08:30:32 +0000
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0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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1 /*==========================================================================
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2 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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3 // mcount.S
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4 //
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5 // Cortex-M mcount implementation
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6 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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7 //==========================================================================
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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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.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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11 // Copyright (C) 2014 Free Software Foundation, Inc.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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12 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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13 // eCos is free software; you can redistribute it and/or modify it under
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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14 // the terms of the GNU General Public License as published by the Free
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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15 // Software Foundation; either version 2 or (at your option) any later
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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16 // version.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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17 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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21 // for more details.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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22 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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23 // You should have received a copy of the GNU General Public License
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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27 // As a special exception, if other files instantiate templates or use
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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30 // this file does not by itself cause the resulting work to be covered by
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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31 // the GNU General Public License. However the source code for this file
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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32 // must still be made available in accordance with section (3) of the GNU
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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33 // General Public License v2.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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34 //
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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35 // This exception does not invalidate any other reasons why a work based
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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36 // on this file might be covered by the GNU General Public License.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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37 // -------------------------------------------
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jld
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43 // Contributor(s):
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44 // Date: 2014-02-28
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45 // Description: This file provides mcount functions used for
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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46 // call-graph profiling.
0e7f32e78b4d * src/mcount.S: Add mcount functions for call-graph profiling.
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //========================================================================
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51 */
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52
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53 #include <pkgconf/hal_cortexm.h>
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54
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55 /*
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56 // GCC inserts mcount code at the start of every function when compiling
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57 // with "-pg". For GCC prior to version 4.4 targeting Cortex-M,
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58 // the following code is inserted:
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59 //
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60 // mov r12, lr
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61 // bl mcount
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62 // .word <data pointer>
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63 //
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64 // For GCC version 4.4 and later targeting Cortex-M, the following code is
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65 // inserted:
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66 //
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67 // push { lr }
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68 // bl __gnu_mcount_nc
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69 //
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70 // We provide implementations of both mcount() and __gnu_mcount_nc() to
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71 // call the eCos __profile_mcount() function.
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72 */
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73
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74 .syntax unified
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75 .globl mcount
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76 .section .text.mcount
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77 .thumb_func
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78 mcount:
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79 // resume execution beyond the data pointer on return to caller
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80 add lr, lr, #4
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81
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82 // caller assumes r0-r3 will be preserved (non-AAPCS), we use
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83 // r6 and must preserve lr across our __profile_mcount() call
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84 push { r0, r1, r2, r3, r6, lr }
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85
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86 // set up parameters for __profile_mcount()
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87 sub r0, r12, #2
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88 bic r0, r0, #1
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89 bic r1, lr, #1
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90
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91 // disable interrupts
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92 mov r2, #CYGNUM_HAL_CORTEXM_PRIORITY_MAX
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93 mrs r6, basepri
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94 msr basepri, r2
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95
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96 // call eCos __profile_mcount()
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97 // r6 is preserved across the call per AAPCS
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98 bl __profile_mcount
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99
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100 // restore interrupts
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101 msr basepri, r6
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102
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103 // restore registers and return
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104 pop { r0, r1, r2, r3, r6, pc }
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105
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106
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107 .globl __gnu_mcount_nc
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108 .section .text.__gnu_mcount_nc
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109 .thumb_func
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110 __gnu_mcount_nc:
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111 // caller assumes r0-r3 will be preserved (non-AAPCS), we use
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112 // r6 and must preserve lr across our __profile_mcount() call
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113 push { r0, r1, r2, r3, r6, lr }
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114
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115 // set up parameters for __profile_mcount()
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116 ldr r0, [ sp, #24 ]
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117 sub r0, r0, #2
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118 bic r0, r0, #1
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119 bic r1, lr, #1
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120
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121 // disable interrupts
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122 mov r2, #CYGNUM_HAL_CORTEXM_PRIORITY_MAX
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123 mrs r6, basepri
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124 msr basepri, r2
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125
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126 // call eCos __profile_mcount()
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127 // r6 is preserved across the call per AAPCS
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128 bl __profile_mcount
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129
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130 // restore interrupts
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131 msr basepri, r6
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132
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133 // restore registers and return
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134 pop { r0, r1, r2, r3, r6, r12, lr }
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135 bx r12
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136
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137 //==========================================================================
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138 // end of mcount.S