diff options
| -rw-r--r-- | tools/perf/arch/arm64/util/perf_regs.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/tools/perf/arch/arm64/util/perf_regs.c b/tools/perf/arch/arm64/util/perf_regs.c index 54efa12fdbea..2518cde18b34 100644 --- a/tools/perf/arch/arm64/util/perf_regs.c +++ b/tools/perf/arch/arm64/util/perf_regs.c @@ -1,4 +1,12 @@ // SPDX-License-Identifier: GPL-2.0 +#include <errno.h> +#include <regex.h> +#include <string.h> +#include <linux/kernel.h> +#include <linux/zalloc.h> + +#include "../../../util/debug.h" +#include "../../../util/event.h" #include "../../../util/perf_regs.h" const struct sample_reg sample_reg_masks[] = { @@ -37,3 +45,89 @@ const struct sample_reg sample_reg_masks[] = { SMPL_REG(pc, PERF_REG_ARM64_PC), SMPL_REG_END }; + +/* %xNUM */ +#define SDT_OP_REGEX1 "^(x[1-2]?[0-9]|3[0-1])$" + +/* [sp], [sp, NUM] */ +#define SDT_OP_REGEX2 "^\\[sp(, )?([0-9]+)?\\]$" + +static regex_t sdt_op_regex1, sdt_op_regex2; + +static int sdt_init_op_regex(void) +{ + static int initialized; + int ret = 0; + + if (initialized) + return 0; + + ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED); + if (ret) + goto error; + + ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED); + if (ret) + goto free_regex1; + + initialized = 1; + return 0; + +free_regex1: + regfree(&sdt_op_regex1); +error: + pr_debug4("Regex compilation error.\n"); + return ret; +} + +/* + * SDT marker arguments on Arm64 uses %xREG or [sp, NUM], currently + * support these two formats. + */ +int arch_sdt_arg_parse_op(char *old_op, char **new_op) +{ + int ret, new_len; + regmatch_t rm[5]; + + ret = sdt_init_op_regex(); + if (ret < 0) + return ret; + + if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) { + /* Extract xNUM */ + new_len = 2; /* % NULL */ + new_len += (int)(rm[1].rm_eo - rm[1].rm_so); + + *new_op = zalloc(new_len); + if (!*new_op) + return -ENOMEM; + + scnprintf(*new_op, new_len, "%%%.*s", + (int)(rm[1].rm_eo - rm[1].rm_so), old_op + rm[1].rm_so); + } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) { + /* [sp], [sp, NUM] or [sp,NUM] */ + new_len = 7; /* + ( % s p ) NULL */ + + /* If the arugment is [sp], need to fill offset '0' */ + if (rm[2].rm_so == -1) + new_len += 1; + else + new_len += (int)(rm[2].rm_eo - rm[2].rm_so); + + *new_op = zalloc(new_len); + if (!*new_op) + return -ENOMEM; + + if (rm[2].rm_so == -1) + scnprintf(*new_op, new_len, "+0(%%sp)"); + else + scnprintf(*new_op, new_len, "+%.*s(%%sp)", + (int)(rm[2].rm_eo - rm[2].rm_so), + old_op + rm[2].rm_so); + } else { + pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); + return SDT_ARG_SKIP; + } + + return SDT_ARG_VALID; +} |