diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/amd64/amd64/machdep.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c index c09ca0e..f74feb1 100644 --- a/sys/arch/amd64/amd64/machdep.c +++ b/sys/arch/amd64/amd64/machdep.c @@ -29,6 +29,8 @@ #include <sys/types.h> #include <sys/syslog.h> +#include <sys/ksyms.h> +#include <sys/panic.h> #include <machine/cpu.h> #include <machine/gdt.h> #include <machine/tss.h> @@ -108,6 +110,50 @@ try_mitigate_spectre(void) ibrs_enable(); } +static const char * +backtrace_addr_to_name(uintptr_t addr, off_t *off) +{ + uintptr_t prev_addr = 0; + const char *name = NULL; + + for (size_t i = 0;;) { + if (g_ksym_table[i].addr > addr) { + *off = addr - prev_addr; + return name; + } + + prev_addr = g_ksym_table[i].addr; + name = g_ksym_table[i].name; + if (g_ksym_table[i++].addr == (uint64_t)-1) + break; + } + + return NULL; +} + +void +backtrace(void) +{ + uintptr_t *rbp; + uintptr_t rip; + off_t off; + const char *name; + + __ASMV("mov %%rbp, %0" : "=r" (rbp) :: "memory"); + while (1) { + rip = rbp[1]; + rbp = (uintptr_t *)rbp[0]; + name = backtrace_addr_to_name(rip, &off); + + if (rbp == NULL) + break; + if (name == NULL) + name = "???"; + + kprintf(OMIT_TIMESTAMP "%p @ <%s+0x%x>\n", rip, name, off); + } +} + void cpu_halt_all(void) { |