diff options
| -rw-r--r-- | sys/arch/amd64/amd64/machdep.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/machdep.c b/sys/arch/amd64/amd64/machdep.c index 52ad64c..9ff96e1 100644 --- a/sys/arch/amd64/amd64/machdep.c +++ b/sys/arch/amd64/amd64/machdep.c @@ -47,6 +47,13 @@ #include <dev/cons/cons.h> #include <string.h> +/* + * This defines the max number of frames + * we will pass while walking the callstack + * in md_backtrace() + */ +#define MAX_FRAME_DEPTH 16 + #define pr_trace(fmt, ...) kprintf("cpu: " fmt, ##__VA_ARGS__) #define pr_error(...) pr_trace(__VA_ARGS__) #define pr_trace_bsp(...) \ @@ -263,9 +270,14 @@ md_backtrace(void) off_t off; const char *name; char line[256]; + uint8_t n = 0; __ASMV("mov %%rbp, %0" : "=r" (rbp) :: "memory"); while (1) { + if (n >= MAX_FRAME_DEPTH) { + break; + } + rip = rbp[1]; rbp = (uintptr_t *)rbp[0]; @@ -290,6 +302,7 @@ md_backtrace(void) name = backtrace_addr_to_name(rip, &off); snprintf(line, sizeof(line), "%p @ <%s+0x%x>\n", rip, name, off); cons_putstr(&g_root_scr, line, strlen(line)); + ++n; } } |