257 lines
6.4 KiB
C
257 lines
6.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <string.h>
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#include <regex.h>
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#include "../../perf.h"
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#include "../../util/util.h"
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#include "../../util/perf_regs.h"
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#include "../../util/debug.h"
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const struct sample_reg sample_reg_masks[] = {
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SMPL_REG(AX, PERF_REG_X86_AX),
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SMPL_REG(BX, PERF_REG_X86_BX),
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SMPL_REG(CX, PERF_REG_X86_CX),
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SMPL_REG(DX, PERF_REG_X86_DX),
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SMPL_REG(SI, PERF_REG_X86_SI),
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SMPL_REG(DI, PERF_REG_X86_DI),
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SMPL_REG(BP, PERF_REG_X86_BP),
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SMPL_REG(SP, PERF_REG_X86_SP),
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SMPL_REG(IP, PERF_REG_X86_IP),
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SMPL_REG(FLAGS, PERF_REG_X86_FLAGS),
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SMPL_REG(CS, PERF_REG_X86_CS),
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SMPL_REG(SS, PERF_REG_X86_SS),
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#ifdef HAVE_ARCH_X86_64_SUPPORT
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SMPL_REG(R8, PERF_REG_X86_R8),
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SMPL_REG(R9, PERF_REG_X86_R9),
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SMPL_REG(R10, PERF_REG_X86_R10),
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SMPL_REG(R11, PERF_REG_X86_R11),
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SMPL_REG(R12, PERF_REG_X86_R12),
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SMPL_REG(R13, PERF_REG_X86_R13),
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SMPL_REG(R14, PERF_REG_X86_R14),
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SMPL_REG(R15, PERF_REG_X86_R15),
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#endif
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SMPL_REG_END
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};
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struct sdt_name_reg {
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const char *sdt_name;
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const char *uprobe_name;
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};
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#define SDT_NAME_REG(n, m) {.sdt_name = "%" #n, .uprobe_name = "%" #m}
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#define SDT_NAME_REG_END {.sdt_name = NULL, .uprobe_name = NULL}
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static const struct sdt_name_reg sdt_reg_tbl[] = {
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SDT_NAME_REG(eax, ax),
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SDT_NAME_REG(rax, ax),
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SDT_NAME_REG(al, ax),
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SDT_NAME_REG(ah, ax),
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SDT_NAME_REG(ebx, bx),
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SDT_NAME_REG(rbx, bx),
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SDT_NAME_REG(bl, bx),
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SDT_NAME_REG(bh, bx),
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SDT_NAME_REG(ecx, cx),
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SDT_NAME_REG(rcx, cx),
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SDT_NAME_REG(cl, cx),
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SDT_NAME_REG(ch, cx),
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SDT_NAME_REG(edx, dx),
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SDT_NAME_REG(rdx, dx),
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SDT_NAME_REG(dl, dx),
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SDT_NAME_REG(dh, dx),
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SDT_NAME_REG(esi, si),
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SDT_NAME_REG(rsi, si),
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SDT_NAME_REG(sil, si),
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SDT_NAME_REG(edi, di),
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SDT_NAME_REG(rdi, di),
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SDT_NAME_REG(dil, di),
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SDT_NAME_REG(ebp, bp),
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SDT_NAME_REG(rbp, bp),
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SDT_NAME_REG(bpl, bp),
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SDT_NAME_REG(rsp, sp),
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SDT_NAME_REG(esp, sp),
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SDT_NAME_REG(spl, sp),
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/* rNN registers */
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SDT_NAME_REG(r8b, r8),
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SDT_NAME_REG(r8w, r8),
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SDT_NAME_REG(r8d, r8),
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SDT_NAME_REG(r9b, r9),
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SDT_NAME_REG(r9w, r9),
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SDT_NAME_REG(r9d, r9),
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SDT_NAME_REG(r10b, r10),
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SDT_NAME_REG(r10w, r10),
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SDT_NAME_REG(r10d, r10),
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SDT_NAME_REG(r11b, r11),
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SDT_NAME_REG(r11w, r11),
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SDT_NAME_REG(r11d, r11),
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SDT_NAME_REG(r12b, r12),
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SDT_NAME_REG(r12w, r12),
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SDT_NAME_REG(r12d, r12),
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SDT_NAME_REG(r13b, r13),
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SDT_NAME_REG(r13w, r13),
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SDT_NAME_REG(r13d, r13),
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SDT_NAME_REG(r14b, r14),
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SDT_NAME_REG(r14w, r14),
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SDT_NAME_REG(r14d, r14),
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SDT_NAME_REG(r15b, r15),
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SDT_NAME_REG(r15w, r15),
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SDT_NAME_REG(r15d, r15),
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SDT_NAME_REG_END,
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};
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/*
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* Perf only supports OP which is in +/-NUM(REG) form.
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* Here plus-minus sign, NUM and parenthesis are optional,
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* only REG is mandatory.
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*
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* SDT events also supports indirect addressing mode with a
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* symbol as offset, scaled mode and constants in OP. But
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* perf does not support them yet. Below are few examples.
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*
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* OP with scaled mode:
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* (%rax,%rsi,8)
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* 10(%ras,%rsi,8)
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*
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* OP with indirect addressing mode:
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* check_action(%rip)
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* mp_+52(%rip)
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* 44+mp_(%rip)
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*
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* OP with constant values:
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* $0
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* $123
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* $-1
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*/
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#define SDT_OP_REGEX "^([+\\-]?)([0-9]*)(\\(?)(%[a-z][a-z0-9]+)(\\)?)$"
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static regex_t sdt_op_regex;
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static int sdt_init_op_regex(void)
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{
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static int initialized;
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int ret = 0;
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if (initialized)
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return 0;
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ret = regcomp(&sdt_op_regex, SDT_OP_REGEX, REG_EXTENDED);
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if (ret < 0) {
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pr_debug4("Regex compilation error.\n");
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return ret;
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}
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initialized = 1;
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return 0;
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}
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/*
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* Max x86 register name length is 5(ex: %r15d). So, 6th char
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* should always contain NULL. This helps to find register name
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* length using strlen, insted of maintaing one more variable.
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*/
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#define SDT_REG_NAME_SIZE 6
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/*
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* The uprobe parser does not support all gas register names;
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* so, we have to replace them (ex. for x86_64: %rax -> %ax).
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* Note: If register does not require renaming, just copy
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* paste as it is, but don't leave it empty.
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*/
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static void sdt_rename_register(char *sdt_reg, int sdt_len, char *uprobe_reg)
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{
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int i = 0;
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for (i = 0; sdt_reg_tbl[i].sdt_name != NULL; i++) {
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if (!strncmp(sdt_reg_tbl[i].sdt_name, sdt_reg, sdt_len)) {
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strcpy(uprobe_reg, sdt_reg_tbl[i].uprobe_name);
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return;
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}
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}
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strncpy(uprobe_reg, sdt_reg, sdt_len);
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}
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int arch_sdt_arg_parse_op(char *old_op, char **new_op)
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{
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char new_reg[SDT_REG_NAME_SIZE] = {0};
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int new_len = 0, ret;
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/*
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* rm[0]: +/-NUM(REG)
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* rm[1]: +/-
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* rm[2]: NUM
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* rm[3]: (
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* rm[4]: REG
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* rm[5]: )
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*/
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regmatch_t rm[6];
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/*
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* Max prefix length is 2 as it may contains sign(+/-)
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* and displacement 0 (Both sign and displacement 0 are
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* optional so it may be empty). Use one more character
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* to hold last NULL so that strlen can be used to find
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* prefix length, instead of maintaing one more variable.
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*/
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char prefix[3] = {0};
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ret = sdt_init_op_regex();
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if (ret < 0)
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return ret;
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/*
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* If unsupported OR does not match with regex OR
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* register name too long, skip it.
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*/
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if (strchr(old_op, ',') || strchr(old_op, '$') ||
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regexec(&sdt_op_regex, old_op, 6, rm, 0) ||
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rm[4].rm_eo - rm[4].rm_so > SDT_REG_NAME_SIZE) {
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pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
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return SDT_ARG_SKIP;
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}
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/*
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* Prepare prefix.
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* If SDT OP has parenthesis but does not provide
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* displacement, add 0 for displacement.
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* SDT Uprobe Prefix
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* -----------------------------
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* +24(%rdi) +24(%di) +
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* 24(%rdi) +24(%di) +
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* %rdi %di
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* (%rdi) +0(%di) +0
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* -80(%rbx) -80(%bx) -
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*/
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if (rm[3].rm_so != rm[3].rm_eo) {
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if (rm[1].rm_so != rm[1].rm_eo)
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prefix[0] = *(old_op + rm[1].rm_so);
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else if (rm[2].rm_so != rm[2].rm_eo)
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prefix[0] = '+';
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else
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scnprintf(prefix, sizeof(prefix), "+0");
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}
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/* Rename register */
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sdt_rename_register(old_op + rm[4].rm_so, rm[4].rm_eo - rm[4].rm_so,
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new_reg);
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/* Prepare final OP which should be valid for uprobe_events */
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new_len = strlen(prefix) +
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(rm[2].rm_eo - rm[2].rm_so) +
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(rm[3].rm_eo - rm[3].rm_so) +
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strlen(new_reg) +
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(rm[5].rm_eo - rm[5].rm_so) +
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1; /* NULL */
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*new_op = zalloc(new_len);
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if (!*new_op)
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return -ENOMEM;
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scnprintf(*new_op, new_len, "%.*s%.*s%.*s%.*s%.*s",
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strlen(prefix), prefix,
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(int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so,
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(int)(rm[3].rm_eo - rm[3].rm_so), old_op + rm[3].rm_so,
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strlen(new_reg), new_reg,
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(int)(rm[5].rm_eo - rm[5].rm_so), old_op + rm[5].rm_so);
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return SDT_ARG_VALID;
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}
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