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Message-ID: <20231213001323.718046-7-namhyung@kernel.org> Date: Tue, 12 Dec 2023 16:13:12 -0800 From: Namhyung Kim <namhyung@...nel.org> To: Arnaldo Carvalho de Melo <acme@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Peter Zijlstra <peterz@...radead.org> Cc: Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Stephane Eranian <eranian@...gle.com>, Masami Hiramatsu <mhiramat@...nel.org>, linux-toolchains@...r.kernel.org, linux-trace-devel@...r.kernel.org Subject: [PATCH 06/17] perf annotate: Add annotate_get_insn_location() The annotate_get_insn_location() is to get the detailed information of instruction locations like registers and offset. It has source and target operands locations in an array. Each operand can have a register and an offset. The offset is meaningful when mem_ref flag is set. Signed-off-by: Namhyung Kim <namhyung@...nel.org> --- tools/perf/util/annotate.c | 107 +++++++++++++++++++++++++++++++++++++ tools/perf/util/annotate.h | 36 +++++++++++++ 2 files changed, 143 insertions(+) diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index 27b2a9961cd5..7c597440dc2e 100644 --- a/tools/perf/util/annotate.c +++ b/tools/perf/util/annotate.c @@ -31,6 +31,7 @@ #include "bpf-utils.h" #include "block-range.h" #include "string2.h" +#include "dwarf-regs.h" #include "util/event.h" #include "util/sharded_mutex.h" #include "arch/common.h" @@ -3518,3 +3519,109 @@ int annotate_check_args(void) } return 0; } + +/* + * Get register number and access offset from the given instruction. + * It assumes AT&T x86 asm format like OFFSET(REG). Maybe it needs + * to revisit the format when it handles different architecture. + * Fills @reg and @offset when return 0. + */ +static int extract_reg_offset(struct arch *arch, const char *str, + struct annotated_op_loc *op_loc) +{ + char *p; + char *regname; + + if (arch->objdump.register_char == 0) + return -1; + + /* + * It should start from offset, but it's possible to skip 0 + * in the asm. So 0(%rax) should be same as (%rax). + * + * However, it also start with a segment select register like + * %gs:0x18(%rbx). In that case it should skip the part. + */ + if (*str == arch->objdump.register_char) { + while (*str && !isdigit(*str) && + *str != arch->objdump.memory_ref_char) + str++; + } + + op_loc->offset = strtol(str, &p, 0); + + p = strchr(p, arch->objdump.register_char); + if (p == NULL) + return -1; + + regname = strdup(p); + if (regname == NULL) + return -1; + + op_loc->reg = get_dwarf_regnum(regname, 0); + free(regname); + return 0; +} + +/** + * annotate_get_insn_location - Get location of instruction + * @arch: the architecture info + * @dl: the target instruction + * @loc: a buffer to save the data + * + * Get detailed location info (register and offset) in the instruction. + * It needs both source and target operand and whether it accesses a + * memory location. The offset field is meaningful only when the + * corresponding mem flag is set. + * + * Some examples on x86: + * + * mov (%rax), %rcx # src_reg = rax, src_mem = 1, src_offset = 0 + * # dst_reg = rcx, dst_mem = 0 + * + * mov 0x18, %r8 # src_reg = -1, dst_reg = r8 + */ +int annotate_get_insn_location(struct arch *arch, struct disasm_line *dl, + struct annotated_insn_loc *loc) +{ + struct ins_operands *ops; + struct annotated_op_loc *op_loc; + int i; + + if (!strcmp(dl->ins.name, "lock")) + ops = dl->ops.locked.ops; + else + ops = &dl->ops; + + if (ops == NULL) + return -1; + + memset(loc, 0, sizeof(*loc)); + + for_each_insn_op_loc(loc, i, op_loc) { + const char *insn_str = ops->source.raw; + + if (i == INSN_OP_TARGET) + insn_str = ops->target.raw; + + /* Invalidate the register by default */ + op_loc->reg = -1; + + if (insn_str == NULL) + continue; + + if (strchr(insn_str, arch->objdump.memory_ref_char)) { + op_loc->mem_ref = true; + extract_reg_offset(arch, insn_str, op_loc); + } else { + char *s = strdup(insn_str); + + if (s) { + op_loc->reg = get_dwarf_regnum(s, 0); + free(s); + } + } + } + + return 0; +} diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h index 2ef7e7dda7bd..25ae8893d4f9 100644 --- a/tools/perf/util/annotate.h +++ b/tools/perf/util/annotate.h @@ -439,4 +439,40 @@ int annotate_parse_percent_type(const struct option *opt, const char *_str, int annotate_check_args(void); +/** + * struct annotated_op_loc - Location info of instruction operand + * @reg: Register in the operand + * @offset: Memory access offset in the operand + * @mem_ref: Whether the operand accesses memory + */ +struct annotated_op_loc { + int reg; + int offset; + bool mem_ref; +}; + +enum annotated_insn_ops { + INSN_OP_SOURCE = 0, + INSN_OP_TARGET = 1, + + INSN_OP_MAX, +}; + +/** + * struct annotated_insn_loc - Location info of instruction + * @ops: Array of location info for source and target operands + */ +struct annotated_insn_loc { + struct annotated_op_loc ops[INSN_OP_MAX]; +}; + +#define for_each_insn_op_loc(insn_loc, i, op_loc) \ + for (i = INSN_OP_SOURCE, op_loc = &(insn_loc)->ops[i]; \ + i < INSN_OP_MAX; \ + i++, op_loc++) + +/* Get detailed location info in the instruction */ +int annotate_get_insn_location(struct arch *arch, struct disasm_line *dl, + struct annotated_insn_loc *loc); + #endif /* __PERF_ANNOTATE_H */ -- 2.43.0.472.g3155946c3a-goog
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