diff options
Diffstat (limited to 'gdb/nat')
| -rw-r--r-- | gdb/nat/linux-btrace.c | 70 |
1 files changed, 48 insertions, 22 deletions
diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c index 62c0acf..3093a5c 100644 --- a/gdb/nat/linux-btrace.c +++ b/gdb/nat/linux-btrace.c @@ -59,6 +59,41 @@ struct perf_event_sample struct perf_event_bts bts; }; +/* Identify the cpu we're running on. */ +static struct btrace_cpu +btrace_this_cpu (void) +{ + struct btrace_cpu cpu; + unsigned int eax, ebx, ecx, edx; + int ok; + + memset (&cpu, 0, sizeof (cpu)); + + ok = x86_cpuid (0, &eax, &ebx, &ecx, &edx); + if (ok != 0) + { + if (ebx == signature_INTEL_ebx && ecx == signature_INTEL_ecx + && edx == signature_INTEL_edx) + { + unsigned int cpuid, ignore; + + ok = x86_cpuid (1, &cpuid, &ignore, &ignore, &ignore); + if (ok != 0) + { + cpu.vendor = CV_INTEL; + + cpu.family = (cpuid >> 8) & 0xf; + cpu.model = (cpuid >> 4) & 0xf; + + if (cpu.family == 0x6) + cpu.model += (cpuid >> 12) & 0xf0; + } + } + } + + return cpu; +} + /* Return non-zero if there is new data in PEVENT; zero otherwise. */ static int @@ -302,22 +337,12 @@ kernel_supports_bts (void) /* Check whether an Intel cpu supports BTS. */ static int -intel_supports_bts (void) +intel_supports_bts (const struct btrace_cpu *cpu) { - unsigned int cpuid, model, family; - - if (!x86_cpuid (1, &cpuid, NULL, NULL, NULL)) - return 0; - - family = (cpuid >> 8) & 0xf; - model = (cpuid >> 4) & 0xf; - - switch (family) + switch (cpu->family) { case 0x6: - model += (cpuid >> 12) & 0xf0; - - switch (model) + switch (cpu->model) { case 0x1a: /* Nehalem */ case 0x1f: @@ -345,17 +370,18 @@ intel_supports_bts (void) static int cpu_supports_bts (void) { - unsigned int ebx, ecx, edx; + struct btrace_cpu cpu; - if (!x86_cpuid (0, NULL, &ebx, &ecx, &edx)) - return 0; - - if (ebx == signature_INTEL_ebx && ecx == signature_INTEL_ecx - && edx == signature_INTEL_edx) - return intel_supports_bts (); + cpu = btrace_this_cpu (); + switch (cpu.vendor) + { + default: + /* Don't know about others. Let's assume they do. */ + return 1; - /* Don't know about others. Let's assume they do. */ - return 1; + case CV_INTEL: + return intel_supports_bts (&cpu); + } } /* Check whether the linux target supports BTS. */ |