1 #include <string.h> 2 3 #include "../../perf.h" 4 #include "../../util/util.h" 5 #include "../../util/perf_regs.h" 6 7 const struct sample_reg sample_reg_masks[] = { 8 SMPL_REG(AX, PERF_REG_X86_AX), 9 SMPL_REG(BX, PERF_REG_X86_BX), 10 SMPL_REG(CX, PERF_REG_X86_CX), 11 SMPL_REG(DX, PERF_REG_X86_DX), 12 SMPL_REG(SI, PERF_REG_X86_SI), 13 SMPL_REG(DI, PERF_REG_X86_DI), 14 SMPL_REG(BP, PERF_REG_X86_BP), 15 SMPL_REG(SP, PERF_REG_X86_SP), 16 SMPL_REG(IP, PERF_REG_X86_IP), 17 SMPL_REG(FLAGS, PERF_REG_X86_FLAGS), 18 SMPL_REG(CS, PERF_REG_X86_CS), 19 SMPL_REG(SS, PERF_REG_X86_SS), 20 #ifdef HAVE_ARCH_X86_64_SUPPORT 21 SMPL_REG(R8, PERF_REG_X86_R8), 22 SMPL_REG(R9, PERF_REG_X86_R9), 23 SMPL_REG(R10, PERF_REG_X86_R10), 24 SMPL_REG(R11, PERF_REG_X86_R11), 25 SMPL_REG(R12, PERF_REG_X86_R12), 26 SMPL_REG(R13, PERF_REG_X86_R13), 27 SMPL_REG(R14, PERF_REG_X86_R14), 28 SMPL_REG(R15, PERF_REG_X86_R15), 29 #endif 30 SMPL_REG_END 31 }; 32 33 struct sdt_name_reg { 34 const char *sdt_name; 35 const char *uprobe_name; 36 }; 37 #define SDT_NAME_REG(n, m) {.sdt_name = "%" #n, .uprobe_name = "%" #m} 38 #define SDT_NAME_REG_END {.sdt_name = NULL, .uprobe_name = NULL} 39 40 static const struct sdt_name_reg sdt_reg_renamings[] = { 41 SDT_NAME_REG(eax, ax), 42 SDT_NAME_REG(rax, ax), 43 SDT_NAME_REG(ebx, bx), 44 SDT_NAME_REG(rbx, bx), 45 SDT_NAME_REG(ecx, cx), 46 SDT_NAME_REG(rcx, cx), 47 SDT_NAME_REG(edx, dx), 48 SDT_NAME_REG(rdx, dx), 49 SDT_NAME_REG(esi, si), 50 SDT_NAME_REG(rsi, si), 51 SDT_NAME_REG(edi, di), 52 SDT_NAME_REG(rdi, di), 53 SDT_NAME_REG(ebp, bp), 54 SDT_NAME_REG(rbp, bp), 55 SDT_NAME_REG_END, 56 }; 57 58 int sdt_rename_register(char **pdesc, char *old_name) 59 { 60 const struct sdt_name_reg *rnames = sdt_reg_renamings; 61 char *new_desc, *old_desc = *pdesc; 62 size_t prefix_len, sdt_len, uprobe_len, old_desc_len, offset; 63 int ret = -1; 64 65 while (ret != 0 && rnames->sdt_name != NULL) { 66 sdt_len = strlen(rnames->sdt_name); 67 ret = strncmp(old_name, rnames->sdt_name, sdt_len); 68 rnames += !!ret; 69 } 70 71 if (rnames->sdt_name == NULL) 72 return 0; 73 74 sdt_len = strlen(rnames->sdt_name); 75 uprobe_len = strlen(rnames->uprobe_name); 76 old_desc_len = strlen(old_desc) + 1; 77 78 new_desc = zalloc(old_desc_len + uprobe_len - sdt_len); 79 if (new_desc == NULL) 80 return -1; 81 82 /* Copy the chars before the register name (at least '%') */ 83 prefix_len = old_name - old_desc; 84 memcpy(new_desc, old_desc, prefix_len); 85 86 /* Copy the new register name */ 87 memcpy(new_desc + prefix_len, rnames->uprobe_name, uprobe_len); 88 89 /* Copy the chars after the register name (if need be) */ 90 offset = prefix_len + sdt_len; 91 if (offset < old_desc_len) { 92 /* 93 * The orginal register name can be suffixed by 'b', 94 * 'w' or 'd' to indicate its size; so, we need to 95 * skip this char if we met one. 96 */ 97 char sfx = old_desc[offset]; 98 99 if (sfx == 'b' || sfx == 'w' || sfx == 'd') 100 offset++; 101 } 102 103 if (offset < old_desc_len) 104 memcpy(new_desc + prefix_len + uprobe_len, 105 old_desc + offset, old_desc_len - offset); 106 107 free(old_desc); 108 *pdesc = new_desc; 109 110 return 0; 111 } 112