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#include <string.h>
#include "../../perf.h"
#include "../../util/util.h"
#include "../../util/perf_regs.h"
const struct sample_reg sample_reg_masks[] = {
SMPL_REG(AX, PERF_REG_X86_AX),
SMPL_REG(BX, PERF_REG_X86_BX),
SMPL_REG(CX, PERF_REG_X86_CX),
SMPL_REG(DX, PERF_REG_X86_DX),
SMPL_REG(SI, PERF_REG_X86_SI),
SMPL_REG(DI, PERF_REG_X86_DI),
SMPL_REG(BP, PERF_REG_X86_BP),
SMPL_REG(SP, PERF_REG_X86_SP),
SMPL_REG(IP, PERF_REG_X86_IP),
SMPL_REG(FLAGS, PERF_REG_X86_FLAGS),
SMPL_REG(CS, PERF_REG_X86_CS),
SMPL_REG(SS, PERF_REG_X86_SS),
#ifdef HAVE_ARCH_X86_64_SUPPORT
SMPL_REG(R8, PERF_REG_X86_R8),
SMPL_REG(R9, PERF_REG_X86_R9),
SMPL_REG(R10, PERF_REG_X86_R10),
SMPL_REG(R11, PERF_REG_X86_R11),
SMPL_REG(R12, PERF_REG_X86_R12),
SMPL_REG(R13, PERF_REG_X86_R13),
SMPL_REG(R14, PERF_REG_X86_R14),
SMPL_REG(R15, PERF_REG_X86_R15),
#endif
SMPL_REG_END
};
struct sdt_name_reg {
const char *sdt_name;
const char *uprobe_name;
};
#define SDT_NAME_REG(n, m) {.sdt_name = "%" #n, .uprobe_name = "%" #m}
#define SDT_NAME_REG_END {.sdt_name = NULL, .uprobe_name = NULL}
static const struct sdt_name_reg sdt_reg_renamings[] = {
SDT_NAME_REG(eax, ax),
SDT_NAME_REG(rax, ax),
SDT_NAME_REG(ebx, bx),
SDT_NAME_REG(rbx, bx),
SDT_NAME_REG(ecx, cx),
SDT_NAME_REG(rcx, cx),
SDT_NAME_REG(edx, dx),
SDT_NAME_REG(rdx, dx),
SDT_NAME_REG(esi, si),
SDT_NAME_REG(rsi, si),
SDT_NAME_REG(edi, di),
SDT_NAME_REG(rdi, di),
SDT_NAME_REG(ebp, bp),
SDT_NAME_REG(rbp, bp),
SDT_NAME_REG_END,
};
int sdt_rename_register(char **pdesc, char *old_name)
{
const struct sdt_name_reg *rnames = sdt_reg_renamings;
char *new_desc, *old_desc = *pdesc;
size_t prefix_len, sdt_len, uprobe_len, old_desc_len, offset;
int ret = -1;
while (ret != 0 && rnames->sdt_name != NULL) {
sdt_len = strlen(rnames->sdt_name);
ret = strncmp(old_name, rnames->sdt_name, sdt_len);
rnames += !!ret;
}
if (rnames->sdt_name == NULL)
return 0;
sdt_len = strlen(rnames->sdt_name);
uprobe_len = strlen(rnames->uprobe_name);
old_desc_len = strlen(old_desc) + 1;
new_desc = zalloc(old_desc_len + uprobe_len - sdt_len);
if (new_desc == NULL)
return -1;
/* Copy the chars before the register name (at least '%') */
prefix_len = old_name - old_desc;
memcpy(new_desc, old_desc, prefix_len);
/* Copy the new register name */
memcpy(new_desc + prefix_len, rnames->uprobe_name, uprobe_len);
/* Copy the chars after the register name (if need be) */
offset = prefix_len + sdt_len;
if (offset < old_desc_len) {
/*
* The orginal register name can be suffixed by 'b',
* 'w' or 'd' to indicate its size; so, we need to
* skip this char if we met one.
*/
char sfx = old_desc[offset];
if (sfx == 'b' || sfx == 'w' || sfx == 'd')
offset++;
}
if (offset < old_desc_len)
memcpy(new_desc + prefix_len + uprobe_len,
old_desc + offset, old_desc_len - offset);
free(old_desc);
*pdesc = new_desc;
return 0;
}
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