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667
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1 extern int printf(const char *,...);
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2 // extern void *alloca(int);
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3
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4 #define A0 0xa0a0a0a0
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5 #define A1 0xa1a1a1a1
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6 #define A2 0xa2a2a2a2
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7 #define A3 0xa3a3a3a3
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8 #define A4 0xa4a4a4a4
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9
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10 #define L0 0xb0b0b0b0
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11 #define L1 0xb1b1b1b1
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12 #define L2 0xb2b2b2b2
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13 #define L3 0xb3b3b3b3
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14 #define L4 0xb4b4b4b4
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15
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16 void *ret;
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17
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669
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18 int dum;
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19
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673
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20 void *float_frame(int a0);
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21
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22 static inline void frame_pointer(char *s) __attribute__((always_inline));
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23
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24 static inline void frame_pointer(char *s)
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25 {
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676
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26 #ifdef i386
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27 void *fr,*st;
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28 __asm__("\tmovl %%ebp,%0\n": "=r" (fr));
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29 __asm__("\tmovl %%esp,%0\n": "=r" (st));
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30 printf("fr=%08x st=%08x at %s\n",fr,st,s);
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31 #else
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32 #ifdef ppc
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673
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33 void *fr,*st;
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34 __asm__("\tmr %0,31\n": "=r" (fr));
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35 __asm__("\tmr %0,1\n": "=r" (st));
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36 printf("fr=%08x st=%08x at %s\n",fr,st,s);
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676
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37 #endif
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38 #endif
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673
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39 }
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40
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41
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42 int
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43 int_frame(int a0)
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44 {
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45 int i0;
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46 int f0;
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47 int *p;
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48 int i1;
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49 frame_pointer("int frame");
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50
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51 i0 = f0 = 0.3;
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52 printf("int 0 offset: %08x\n",&a0-&i0);
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53 printf("int 1 offset: %08x\n",&a0-&i1);
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54 printf("int 1 offset: %08x\n",&a0-(int*)float_frame(A1));
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55 printf("%d\n",f0);
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56 return i0;
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57 }
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58
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59 void *
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60 float_frame(int a0)
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61 {
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62 int i0;
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63 double f0;
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64 int *p;
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65 int i1;
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66 frame_pointer("float frame");
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67
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68 f0 = 0.3;
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69 printf("local0 offset: %08x\n",&a0-&i0);
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70 printf("local1 offset: %08x\n",&a0-&i1);
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71 printf("%g\n",f0);
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72 return &i0;
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73 }
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74
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669
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75 void
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76 called(int a0,int a1,int a2)
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77 {
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673
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78 frame_pointer("called");
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79 dum = a0+a1+a2;
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80 }
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81
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667
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82 void
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83 frame(int a0,int a1,int a2)
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84 {
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85 int l0 = L0;
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676
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86 int *top;
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667
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87 int *p;
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88 int i = 0;
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89 int l1 = L1;
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673
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90 frame_pointer("frame");
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676
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91 if (a1==1) {
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92 top = (int *)__builtin_alloca(16);
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93 printf("alloca %08x\n",top);
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94 } else {
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95 top = &l0;
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96 }
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673
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97 printf("local %08x\n",&l0);
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98
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99 *top = L2;
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100 called(A3,A1,A4);
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101 #define OFFSET 16
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102 i = -OFFSET;
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103 for(p = top-OFFSET;p<top+0x100; ) {
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667
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104 if (*p==(int)ret) {
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676
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105 printf("%08x: %08x ret address\n",p,i);
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667
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106 } else if (*p==A0) {
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676
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107 printf("%08x: %08x caller arg 1\n",p,i);
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667
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108 } else if (*p==A2) {
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676
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109 printf("%08x: %08x caller arg last\n",p,i);
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669
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110 } else if (*p==A3) {
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676
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111 printf("%08x: %08x callee arg 1\n",p,i);
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669
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112 } else if (*p==A4) {
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676
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113 printf("%08x: %08x callee arg last\n",p,i);
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667
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114 } else if (*p==L0) {
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676
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115 printf("%08x: %08x local var top\n",p,i);
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667
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116 } else if (*p==L1) {
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676
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117 printf("%08x: %08x local var end\n",p,i);
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667
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118 } else if (*p==L2) {
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676
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119 printf("%08x: %08x stack top (alloca)\n",p,i);
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120 } else {
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121 // printf(" %08x",*p);
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122 }
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123 i+= sizeof(int);
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124 p++;
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125 }
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126 }
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127
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128
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129 int
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130 main()
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131 {
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673
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132 frame_pointer("main");
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667
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133 ret = &&label;
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134 frame(A0,A1,A2);
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676
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135 frame(A0,1,A2);
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673
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136 printf("\n");
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137 float_frame(A0);
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138 int_frame(A0);
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667
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139 label:
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140 return 0;
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141 }
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