diff options
Diffstat (limited to 'lib/libpmcstat')
| -rw-r--r-- | lib/libpmcstat/libpmcstat_image.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/libpmcstat/libpmcstat_image.c b/lib/libpmcstat/libpmcstat_image.c index 94d103228d28..9ee7097e95ec 100644 --- a/lib/libpmcstat/libpmcstat_image.c +++ b/lib/libpmcstat/libpmcstat_image.c @@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/endian.h> #include <sys/pmc.h> +#include <sys/sysctl.h> #include <sys/imgact_aout.h> #include <sys/imgact_elf.h> @@ -176,6 +177,10 @@ pmcstat_image_link(struct pmcstat_process *pp, struct pmcstat_image *image, { struct pmcstat_pcmap *pcm, *pcmnew; uintfptr_t offset; +#ifdef __powerpc__ + unsigned long kernbase; + size_t kernbase_len; +#endif assert(image->pi_type != PMCSTAT_IMAGE_UNKNOWN && image->pi_type != PMCSTAT_IMAGE_INDETERMINABLE); @@ -184,6 +189,26 @@ pmcstat_image_link(struct pmcstat_process *pp, struct pmcstat_image *image, err(EX_OSERR, "ERROR: Cannot create a map entry"); /* + * PowerPC kernel is of DYN type and it has a base address + * where it is initially loaded, before being relocated. + * As the address in 'start' is where the kernel was relocated to, + * but the symbols always use the original base address, we need to + * subtract it to get the correct offset. + */ +#ifdef __powerpc__ + if (pp->pp_pid == -1) { + kernbase = 0; + kernbase_len = sizeof(kernbase); + if (sysctlbyname("kern.base_address", &kernbase, &kernbase_len, + NULL, 0) == -1) + warnx( + "WARNING: Could not retrieve kernel base address"); + else + start -= kernbase; + } +#endif + + /* * Adjust the map entry to only cover the text portion * of the object. */ |