diff options
Diffstat (limited to 'gdb/nat')
| -rw-r--r-- | gdb/nat/linux-btrace.c | 140 | ||||
| -rw-r--r-- | gdb/nat/linux-btrace.h | 35 |
2 files changed, 133 insertions, 42 deletions
diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c index 5b22661..e827e92 100644 --- a/gdb/nat/linux-btrace.c +++ b/gdb/nat/linux-btrace.c @@ -90,8 +90,8 @@ perf_event_is_kernel_addr (const struct btrace_target_info *tinfo, /* Check whether a perf event record should be skipped. */ static inline int -perf_event_skip_record (const struct btrace_target_info *tinfo, - const struct perf_event_bts *bts) +perf_event_skip_bts_record (const struct btrace_target_info *tinfo, + const struct perf_event_bts *bts) { /* The hardware may report branches from kernel into user space. Branches from user into kernel space will be suppressed. We filter the former to @@ -194,7 +194,7 @@ perf_event_read_bts (struct btrace_target_info* tinfo, const uint8_t *begin, break; } - if (perf_event_skip_record (tinfo, &psample->bts)) + if (perf_event_skip_bts_record (tinfo, &psample->bts)) continue; /* We found a valid sample, so we can complete the current block. */ @@ -395,39 +395,42 @@ linux_supports_btrace (struct target_ops *ops, enum btrace_format format) internal_error (__FILE__, __LINE__, _("Unknown branch trace format")); } -/* See linux-btrace.h. */ +/* Enable branch tracing in BTS format. */ -struct btrace_target_info * -linux_enable_btrace (ptid_t ptid) +static struct btrace_target_info * +linux_enable_bts (ptid_t ptid, const struct btrace_config *conf) { struct perf_event_mmap_page *header; struct btrace_target_info *tinfo; + struct btrace_tinfo_bts *bts; int pid, pg; tinfo = xzalloc (sizeof (*tinfo)); tinfo->ptid = ptid; + tinfo->ptr_bits = 0; - tinfo->attr.size = sizeof (tinfo->attr); - tinfo->attr.type = PERF_TYPE_HARDWARE; - tinfo->attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; - tinfo->attr.sample_period = 1; + tinfo->conf.format = BTRACE_FORMAT_BTS; + bts = &tinfo->variant.bts; - /* We sample from and to address. */ - tinfo->attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR; + bts->attr.size = sizeof (bts->attr); + bts->attr.type = PERF_TYPE_HARDWARE; + bts->attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; + bts->attr.sample_period = 1; - tinfo->attr.exclude_kernel = 1; - tinfo->attr.exclude_hv = 1; - tinfo->attr.exclude_idle = 1; + /* We sample from and to address. */ + bts->attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR; - tinfo->ptr_bits = 0; + bts->attr.exclude_kernel = 1; + bts->attr.exclude_hv = 1; + bts->attr.exclude_idle = 1; pid = ptid_get_lwp (ptid); if (pid == 0) pid = ptid_get_pid (ptid); errno = 0; - tinfo->file = syscall (SYS_perf_event_open, &tinfo->attr, pid, -1, -1, 0); - if (tinfo->file < 0) + bts->file = syscall (SYS_perf_event_open, &bts->attr, pid, -1, -1, 0); + if (bts->file < 0) goto err; /* We try to allocate as much buffer as we can get. @@ -437,7 +440,7 @@ linux_enable_btrace (ptid_t ptid) { /* The number of pages we request needs to be a power of two. */ header = mmap (NULL, ((1 << pg) + 1) * PAGE_SIZE, PROT_READ, MAP_SHARED, - tinfo->file, 0); + bts->file, 0); if (header != MAP_FAILED) break; } @@ -445,17 +448,17 @@ linux_enable_btrace (ptid_t ptid) if (header == MAP_FAILED) goto err_file; - tinfo->header = header; - tinfo->bts.mem = ((const uint8_t *) header) + PAGE_SIZE; - tinfo->bts.size = (1 << pg) * PAGE_SIZE; - tinfo->bts.data_head = &header->data_head; - tinfo->bts.last_head = 0; + bts->header = header; + bts->bts.mem = ((const uint8_t *) header) + PAGE_SIZE; + bts->bts.size = (1 << pg) * PAGE_SIZE; + bts->bts.data_head = &header->data_head; + bts->bts.last_head = 0; return tinfo; err_file: /* We were not able to allocate any buffer. */ - close (tinfo->file); + close (bts->file); err: xfree (tinfo); @@ -464,16 +467,60 @@ linux_enable_btrace (ptid_t ptid) /* See linux-btrace.h. */ -enum btrace_error -linux_disable_btrace (struct btrace_target_info *tinfo) +struct btrace_target_info * +linux_enable_btrace (ptid_t ptid, const struct btrace_config *conf) +{ + struct btrace_target_info *tinfo; + + tinfo = NULL; + switch (conf->format) + { + case BTRACE_FORMAT_NONE: + break; + + case BTRACE_FORMAT_BTS: + tinfo = linux_enable_bts (ptid, conf); + break; + } + + return tinfo; +} + +/* Disable BTS tracing. */ + +static enum btrace_error +linux_disable_bts (struct btrace_tinfo_bts *tinfo) { munmap((void *) tinfo->header, tinfo->bts.size + PAGE_SIZE); close (tinfo->file); - xfree (tinfo); return BTRACE_ERR_NONE; } +/* See linux-btrace.h. */ + +enum btrace_error +linux_disable_btrace (struct btrace_target_info *tinfo) +{ + enum btrace_error errcode; + + errcode = BTRACE_ERR_NOT_SUPPORTED; + switch (tinfo->conf.format) + { + case BTRACE_FORMAT_NONE: + break; + + case BTRACE_FORMAT_BTS: + errcode = linux_disable_bts (&tinfo->variant.bts); + break; + } + + if (errcode == BTRACE_ERR_NONE) + xfree (tinfo); + + return errcode; +} + /* Read branch trace data in BTS format for the thread given by TINFO into BTRACE using the TYPE reading method. */ @@ -487,7 +534,7 @@ linux_read_bts (struct btrace_data_bts *btrace, unsigned long long data_head, data_tail, buffer_size, size; unsigned int retries = 5; - pevent = &tinfo->bts; + pevent = &tinfo->variant.bts.bts; /* For delta reads, we return at least the partial last block containing the current PC. */ @@ -570,11 +617,28 @@ linux_read_btrace (struct btrace_data *btrace, struct btrace_target_info *tinfo, enum btrace_read_type type) { - /* We read btrace in BTS format. */ - btrace->format = BTRACE_FORMAT_BTS; - btrace->variant.bts.blocks = NULL; + switch (tinfo->conf.format) + { + case BTRACE_FORMAT_NONE: + return BTRACE_ERR_NOT_SUPPORTED; + + case BTRACE_FORMAT_BTS: + /* We read btrace in BTS format. */ + btrace->format = BTRACE_FORMAT_BTS; + btrace->variant.bts.blocks = NULL; + + return linux_read_bts (&btrace->variant.bts, tinfo, type); + } + + internal_error (__FILE__, __LINE__, _("Unkown branch trace format.")); +} + +/* See linux-btrace.h. */ - return linux_read_bts (&btrace->variant.bts, tinfo, type); +const struct btrace_config * +linux_btrace_conf (const struct btrace_target_info *tinfo) +{ + return &tinfo->conf; } #else /* !HAVE_LINUX_PERF_EVENT_H */ @@ -590,7 +654,7 @@ linux_supports_btrace (struct target_ops *ops, enum btrace_format format) /* See linux-btrace.h. */ struct btrace_target_info * -linux_enable_btrace (ptid_t ptid) +linux_enable_btrace (ptid_t ptid, const struct btrace_config *conf) { return NULL; } @@ -613,4 +677,12 @@ linux_read_btrace (struct btrace_data *btrace, return BTRACE_ERR_NOT_SUPPORTED; } +/* See linux-btrace.h. */ + +const struct btrace_config * +linux_btrace_conf (const struct btrace_target_info *tinfo) +{ + return NULL; +} + #endif /* !HAVE_LINUX_PERF_EVENT_H */ diff --git a/gdb/nat/linux-btrace.h b/gdb/nat/linux-btrace.h index 602a571..12cdcde 100644 --- a/gdb/nat/linux-btrace.h +++ b/gdb/nat/linux-btrace.h @@ -48,18 +48,13 @@ struct perf_event_buffer /* The data_head value from the last read. */ unsigned long long last_head; }; -#endif /* HAVE_LINUX_PERF_EVENT_H */ -/* Branch trace target information per thread. */ -struct btrace_target_info +/* Branch trace target information for BTS tracing. */ +struct btrace_tinfo_bts { -#if HAVE_LINUX_PERF_EVENT_H /* The Linux perf_event configuration for collecting the branch trace. */ struct perf_event_attr attr; - /* The ptid of this thread. */ - ptid_t ptid; - /* The perf event file. */ int file; @@ -68,6 +63,25 @@ struct btrace_target_info /* The BTS perf event buffer. */ struct perf_event_buffer bts; +}; +#endif /* HAVE_LINUX_PERF_EVENT_H */ + +/* Branch trace target information per thread. */ +struct btrace_target_info +{ + /* The ptid of this thread. */ + ptid_t ptid; + + /* The obtained branch trace configuration. */ + struct btrace_config conf; + +#if HAVE_LINUX_PERF_EVENT_H + /* The branch tracing format specific information. */ + union + { + /* CONF.FORMAT == BTRACE_FORMAT_BTS. */ + struct btrace_tinfo_bts bts; + } variant; #endif /* HAVE_LINUX_PERF_EVENT_H */ /* The size of a pointer in bits for this thread. @@ -80,7 +94,8 @@ struct btrace_target_info extern int linux_supports_btrace (struct target_ops *, enum btrace_format); /* See to_enable_btrace in target.h. */ -extern struct btrace_target_info *linux_enable_btrace (ptid_t ptid); +extern struct btrace_target_info * + linux_enable_btrace (ptid_t ptid, const struct btrace_config *conf); /* See to_disable_btrace in target.h. */ extern enum btrace_error linux_disable_btrace (struct btrace_target_info *ti); @@ -90,4 +105,8 @@ extern enum btrace_error linux_read_btrace (struct btrace_data *btrace, struct btrace_target_info *btinfo, enum btrace_read_type type); +/* See to_btrace_conf in target.h. */ +extern const struct btrace_config * + linux_btrace_conf (const struct btrace_target_info *); + #endif /* LINUX_BTRACE_H */ |