diff options
Diffstat (limited to 'tools/perf/util/probe-file.c')
| -rw-r--r-- | tools/perf/util/probe-file.c | 170 |
1 files changed, 166 insertions, 4 deletions
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index c3c287125be5..d741634cbfc0 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -27,6 +27,7 @@ #include "probe-event.h" #include "probe-file.h" #include "session.h" +#include "perf_regs.h" /* 4096 - 2 ('\n' + '\0') */ #define MAX_CMDLEN 4094 @@ -688,6 +689,166 @@ static unsigned long long sdt_note__get_addr(struct sdt_note *note) : (unsigned long long)note->addr.a64[0]; } +static const char * const type_to_suffix[] = { + ":s64", "", "", "", ":s32", "", ":s16", ":s8", + "", ":u8", ":u16", "", ":u32", "", "", "", ":u64" +}; + +static int synthesize_sdt_probe_arg(struct strbuf *buf, int i, const char *arg) +{ + char *tmp, *desc = strdup(arg); + const char *prefix = "", *suffix = ""; + int ret = -1; + + if (desc == NULL) { + pr_debug4("Allocation error\n"); + return ret; + } + + tmp = strchr(desc, '@'); + if (tmp) { + long type_idx; + /* + * Isolate the string number and convert it into a + * binary value; this will be an index to get suffix + * of the uprobe name (defining the type) + */ + tmp[0] = '\0'; + type_idx = strtol(desc, NULL, 10); + /* Check that the conversion went OK */ + if (type_idx == LONG_MIN || type_idx == LONG_MAX) { + pr_debug4("Failed to parse sdt type\n"); + goto error; + } + /* Check that the converted value is OK */ + if (type_idx < -8 || type_idx > 8) { + pr_debug4("Failed to get a valid sdt type\n"); + goto error; + } + suffix = type_to_suffix[type_idx + 8]; + /* Get rid of the sdt prefix which is now useless */ + tmp++; + memmove(desc, tmp, strlen(tmp) + 1); + } + + /* + * The uprobe tracer format does not support all the + * addressing modes (notably: in x86 the scaled mode); so, we + * detect ',' characters, if there is just one, there is no + * use converting the sdt arg into a uprobe one. + */ + if (strchr(desc, ',')) { + pr_debug4("Skipping unsupported SDT argument; %s\n", desc); + goto out; + } + + /* + * If the argument addressing mode is indirect, we must check + * a few things... + */ + tmp = strchr(desc, '('); + if (tmp) { + int j; + + /* + * ...if the addressing mode is indirect with a + * positive offset (ex.: "1608(%ax)"), we need to add + * a '+' prefix so as to be compliant with uprobe + * format. + */ + if (desc[0] != '+' && desc[0] != '-') + prefix = "+"; + + /* + * ...or if the addressing mode is indirect with a symbol + * as offset, the argument will not be supported by + * the uprobe tracer format; so, let's skip this one. + */ + for (j = 0; j < tmp - desc; j++) { + if (desc[j] != '+' && desc[j] != '-' && + !isdigit(desc[j])) { + pr_debug4("Skipping unsupported SDT argument; " + "%s\n", desc); + goto out; + } + } + } + + /* + * The uprobe tracer format does not support constants; if we + * find one in the current argument, let's skip the argument. + */ + if (strchr(desc, '$')) { + pr_debug4("Skipping unsupported SDT argument; %s\n", desc); + goto out; + } + + /* + * The uprobe parser does not support all gas register names; + * so, we have to replace them (ex. for x86_64: %rax -> %ax); + * the loop below looks for the register names (starting with + * a '%' and tries to perform the needed renamings. + */ + tmp = strchr(desc, '%'); + while (tmp) { + size_t offset = tmp - desc; + + ret = sdt_rename_register(&desc, desc + offset); + if (ret < 0) + goto error; + + /* + * The desc pointer might have changed; so, let's not + * try to reuse tmp for next lookup + */ + tmp = strchr(desc + offset + 1, '%'); + } + + if (strbuf_addf(buf, " arg%d=%s%s%s", i + 1, prefix, desc, suffix) < 0) + goto error; + +out: + ret = 0; +error: + free(desc); + return ret; +} + +static char *synthesize_sdt_probe_command(struct sdt_note *note, + const char *pathname, + const char *sdtgrp) +{ + struct strbuf buf; + char *ret = NULL, **args; + int i, args_count; + + if (strbuf_init(&buf, 32) < 0) + return NULL; + + if (strbuf_addf(&buf, "p:%s/%s %s:0x%llx", + sdtgrp, note->name, pathname, + sdt_note__get_addr(note)) < 0) + goto error; + + if (!note->args) + goto out; + + if (note->args) { + args = argv_split(note->args, &args_count); + + for (i = 0; i < args_count; ++i) { + if (synthesize_sdt_probe_arg(&buf, i, args[i]) < 0) + goto error; + } + } + +out: + ret = strbuf_detach(&buf, NULL); +error: + strbuf_release(&buf); + return ret; +} + int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname) { struct probe_cache_entry *entry = NULL; @@ -724,11 +885,12 @@ int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname) entry->pev.group = strdup(sdtgrp); list_add_tail(&entry->node, &pcache->entries); } - ret = asprintf(&buf, "p:%s/%s %s:0x%llx", - sdtgrp, note->name, pathname, - sdt_note__get_addr(note)); - if (ret < 0) + buf = synthesize_sdt_probe_command(note, pathname, sdtgrp); + if (!buf) { + ret = -ENOMEM; break; + } + strlist__add(entry->tevlist, buf); free(buf); entry = NULL; |