| // SPDX-License-Identifier: GPL-2.0 |
| #include <errno.h> |
| #include <string.h> |
| #include <regex.h> |
| #include <linux/kernel.h> |
| #include <linux/zalloc.h> |
| |
| #include "../../../perf-sys.h" |
| #include "../../../util/perf_regs.h" |
| #include "../../../util/debug.h" |
| #include "../../../util/event.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_REG2(XMM0, PERF_REG_X86_XMM0), |
| SMPL_REG2(XMM1, PERF_REG_X86_XMM1), |
| SMPL_REG2(XMM2, PERF_REG_X86_XMM2), |
| SMPL_REG2(XMM3, PERF_REG_X86_XMM3), |
| SMPL_REG2(XMM4, PERF_REG_X86_XMM4), |
| SMPL_REG2(XMM5, PERF_REG_X86_XMM5), |
| SMPL_REG2(XMM6, PERF_REG_X86_XMM6), |
| SMPL_REG2(XMM7, PERF_REG_X86_XMM7), |
| SMPL_REG2(XMM8, PERF_REG_X86_XMM8), |
| SMPL_REG2(XMM9, PERF_REG_X86_XMM9), |
| SMPL_REG2(XMM10, PERF_REG_X86_XMM10), |
| SMPL_REG2(XMM11, PERF_REG_X86_XMM11), |
| SMPL_REG2(XMM12, PERF_REG_X86_XMM12), |
| SMPL_REG2(XMM13, PERF_REG_X86_XMM13), |
| SMPL_REG2(XMM14, PERF_REG_X86_XMM14), |
| SMPL_REG2(XMM15, PERF_REG_X86_XMM15), |
| 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_tbl[] = { |
| SDT_NAME_REG(eax, ax), |
| SDT_NAME_REG(rax, ax), |
| SDT_NAME_REG(al, ax), |
| SDT_NAME_REG(ah, ax), |
| SDT_NAME_REG(ebx, bx), |
| SDT_NAME_REG(rbx, bx), |
| SDT_NAME_REG(bl, bx), |
| SDT_NAME_REG(bh, bx), |
| SDT_NAME_REG(ecx, cx), |
| SDT_NAME_REG(rcx, cx), |
| SDT_NAME_REG(cl, cx), |
| SDT_NAME_REG(ch, cx), |
| SDT_NAME_REG(edx, dx), |
| SDT_NAME_REG(rdx, dx), |
| SDT_NAME_REG(dl, dx), |
| SDT_NAME_REG(dh, dx), |
| SDT_NAME_REG(esi, si), |
| SDT_NAME_REG(rsi, si), |
| SDT_NAME_REG(sil, si), |
| SDT_NAME_REG(edi, di), |
| SDT_NAME_REG(rdi, di), |
| SDT_NAME_REG(dil, di), |
| SDT_NAME_REG(ebp, bp), |
| SDT_NAME_REG(rbp, bp), |
| SDT_NAME_REG(bpl, bp), |
| SDT_NAME_REG(rsp, sp), |
| SDT_NAME_REG(esp, sp), |
| SDT_NAME_REG(spl, sp), |
| |
| /* rNN registers */ |
| SDT_NAME_REG(r8b, r8), |
| SDT_NAME_REG(r8w, r8), |
| SDT_NAME_REG(r8d, r8), |
| SDT_NAME_REG(r9b, r9), |
| SDT_NAME_REG(r9w, r9), |
| SDT_NAME_REG(r9d, r9), |
| SDT_NAME_REG(r10b, r10), |
| SDT_NAME_REG(r10w, r10), |
| SDT_NAME_REG(r10d, r10), |
| SDT_NAME_REG(r11b, r11), |
| SDT_NAME_REG(r11w, r11), |
| SDT_NAME_REG(r11d, r11), |
| SDT_NAME_REG(r12b, r12), |
| SDT_NAME_REG(r12w, r12), |
| SDT_NAME_REG(r12d, r12), |
| SDT_NAME_REG(r13b, r13), |
| SDT_NAME_REG(r13w, r13), |
| SDT_NAME_REG(r13d, r13), |
| SDT_NAME_REG(r14b, r14), |
| SDT_NAME_REG(r14w, r14), |
| SDT_NAME_REG(r14d, r14), |
| SDT_NAME_REG(r15b, r15), |
| SDT_NAME_REG(r15w, r15), |
| SDT_NAME_REG(r15d, r15), |
| SDT_NAME_REG_END, |
| }; |
| |
| /* |
| * Perf only supports OP which is in +/-NUM(REG) form. |
| * Here plus-minus sign, NUM and parenthesis are optional, |
| * only REG is mandatory. |
| * |
| * SDT events also supports indirect addressing mode with a |
| * symbol as offset, scaled mode and constants in OP. But |
| * perf does not support them yet. Below are few examples. |
| * |
| * OP with scaled mode: |
| * (%rax,%rsi,8) |
| * 10(%ras,%rsi,8) |
| * |
| * OP with indirect addressing mode: |
| * check_action(%rip) |
| * mp_+52(%rip) |
| * 44+mp_(%rip) |
| * |
| * OP with constant values: |
| * $0 |
| * $123 |
| * $-1 |
| */ |
| #define SDT_OP_REGEX "^([+\\-]?)([0-9]*)(\\(?)(%[a-z][a-z0-9]+)(\\)?)$" |
| |
| static regex_t sdt_op_regex; |
| |
| static int sdt_init_op_regex(void) |
| { |
| static int initialized; |
| int ret = 0; |
| |
| if (initialized) |
| return 0; |
| |
| ret = regcomp(&sdt_op_regex, SDT_OP_REGEX, REG_EXTENDED); |
| if (ret < 0) { |
| pr_debug4("Regex compilation error.\n"); |
| return ret; |
| } |
| |
| initialized = 1; |
| return 0; |
| } |
| |
| /* |
| * Max x86 register name length is 5(ex: %r15d). So, 6th char |
| * should always contain NULL. This helps to find register name |
| * length using strlen, instead of maintaining one more variable. |
| */ |
| #define SDT_REG_NAME_SIZE 6 |
| |
| /* |
| * The uprobe parser does not support all gas register names; |
| * so, we have to replace them (ex. for x86_64: %rax -> %ax). |
| * Note: If register does not require renaming, just copy |
| * paste as it is, but don't leave it empty. |
| */ |
| static void sdt_rename_register(char *sdt_reg, int sdt_len, char *uprobe_reg) |
| { |
| int i = 0; |
| |
| for (i = 0; sdt_reg_tbl[i].sdt_name != NULL; i++) { |
| if (!strncmp(sdt_reg_tbl[i].sdt_name, sdt_reg, sdt_len)) { |
| strcpy(uprobe_reg, sdt_reg_tbl[i].uprobe_name); |
| return; |
| } |
| } |
| |
| strncpy(uprobe_reg, sdt_reg, sdt_len); |
| } |
| |
| int arch_sdt_arg_parse_op(char *old_op, char **new_op) |
| { |
| char new_reg[SDT_REG_NAME_SIZE] = {0}; |
| int new_len = 0, ret; |
| /* |
| * rm[0]: +/-NUM(REG) |
| * rm[1]: +/- |
| * rm[2]: NUM |
| * rm[3]: ( |
| * rm[4]: REG |
| * rm[5]: ) |
| */ |
| regmatch_t rm[6]; |
| /* |
| * Max prefix length is 2 as it may contains sign(+/-) |
| * and displacement 0 (Both sign and displacement 0 are |
| * optional so it may be empty). Use one more character |
| * to hold last NULL so that strlen can be used to find |
| * prefix length, instead of maintaining one more variable. |
| */ |
| char prefix[3] = {0}; |
| |
| ret = sdt_init_op_regex(); |
| if (ret < 0) |
| return ret; |
| |
| /* |
| * If unsupported OR does not match with regex OR |
| * register name too long, skip it. |
| */ |
| if (strchr(old_op, ',') || strchr(old_op, '$') || |
| regexec(&sdt_op_regex, old_op, 6, rm, 0) || |
| rm[4].rm_eo - rm[4].rm_so > SDT_REG_NAME_SIZE) { |
| pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); |
| return SDT_ARG_SKIP; |
| } |
| |
| /* |
| * Prepare prefix. |
| * If SDT OP has parenthesis but does not provide |
| * displacement, add 0 for displacement. |
| * SDT Uprobe Prefix |
| * ----------------------------- |
| * +24(%rdi) +24(%di) + |
| * 24(%rdi) +24(%di) + |
| * %rdi %di |
| * (%rdi) +0(%di) +0 |
| * -80(%rbx) -80(%bx) - |
| */ |
| if (rm[3].rm_so != rm[3].rm_eo) { |
| if (rm[1].rm_so != rm[1].rm_eo) |
| prefix[0] = *(old_op + rm[1].rm_so); |
| else if (rm[2].rm_so != rm[2].rm_eo) |
| prefix[0] = '+'; |
| else |
| scnprintf(prefix, sizeof(prefix), "+0"); |
| } |
| |
| /* Rename register */ |
| sdt_rename_register(old_op + rm[4].rm_so, rm[4].rm_eo - rm[4].rm_so, |
| new_reg); |
| |
| /* Prepare final OP which should be valid for uprobe_events */ |
| new_len = strlen(prefix) + |
| (rm[2].rm_eo - rm[2].rm_so) + |
| (rm[3].rm_eo - rm[3].rm_so) + |
| strlen(new_reg) + |
| (rm[5].rm_eo - rm[5].rm_so) + |
| 1; /* NULL */ |
| |
| *new_op = zalloc(new_len); |
| if (!*new_op) |
| return -ENOMEM; |
| |
| scnprintf(*new_op, new_len, "%.*s%.*s%.*s%.*s%.*s", |
| strlen(prefix), prefix, |
| (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so, |
| (int)(rm[3].rm_eo - rm[3].rm_so), old_op + rm[3].rm_so, |
| strlen(new_reg), new_reg, |
| (int)(rm[5].rm_eo - rm[5].rm_so), old_op + rm[5].rm_so); |
| |
| return SDT_ARG_VALID; |
| } |
| |
| uint64_t arch__intr_reg_mask(void) |
| { |
| struct perf_event_attr attr = { |
| .type = PERF_TYPE_HARDWARE, |
| .config = PERF_COUNT_HW_CPU_CYCLES, |
| .sample_type = PERF_SAMPLE_REGS_INTR, |
| .sample_regs_intr = PERF_REG_EXTENDED_MASK, |
| .precise_ip = 1, |
| .disabled = 1, |
| .exclude_kernel = 1, |
| }; |
| int fd; |
| /* |
| * In an unnamed union, init it here to build on older gcc versions |
| */ |
| attr.sample_period = 1; |
| |
| event_attr_init(&attr); |
| |
| fd = sys_perf_event_open(&attr, 0, -1, -1, 0); |
| if (fd != -1) { |
| close(fd); |
| return (PERF_REG_EXTENDED_MASK | PERF_REGS_MASK); |
| } |
| |
| return PERF_REGS_MASK; |
| } |