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Get --ftrace working on aarch64

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This change implements a new approach to function call logging, that's
based on the GCC flag: -fpatchable-function-entry. Read the commentary
in build/config.mk to learn how it works.
This commit is contained in:
Justine Tunney 2023-06-05 23:35:31 -07:00
parent 5b908bc756
commit eb40cb371d
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GPG key ID: BE714B4575D6E328
934 changed files with 2259 additions and 1268 deletions
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18
libc/runtime/ftracer.c
View file

@ -31,8 +31,6 @@
#include "libc/thread/tls.h"
#include "libc/thread/tls2.h"
#define MAX_NESTING 512
/**
* @fileoverview Plain-text function call logging.
*
@ -41,6 +39,14 @@
* into gzip.
*/
#define MAX_NESTING 512
#ifdef __x86_64__
#define DETOUR_SKEW 2
#elif defined(__aarch64__)
#define DETOUR_SKEW 8
#endif
void ftrace_hook(void);
static int g_stackdigs;
@ -72,6 +78,7 @@ static privileged inline int GetNestingLevel(struct CosmoFtrace *ft,
* according to the System Five NexGen32e ABI.
*/
privileged void ftracer(void) {
uintptr_t fn;
long stackuse;
struct CosmoTib *tib;
struct StackFrame *sf;
@ -91,11 +98,12 @@ privileged void ftracer(void) {
if (_cmpxchg(&ft->ft_noreentry, false, true)) {
sf = __builtin_frame_address(0);
sf = sf->next;
if (sf->addr != ft->ft_lastaddr) {
fn = sf->addr + DETOUR_SKEW;
if (fn != ft->ft_lastaddr) {
stackuse = GetStackAddr() + GetStackSize() - (intptr_t)sf;
kprintf("%rFUN %6P %'13T %'*ld %*s%t\n", g_stackdigs, stackuse,
GetNestingLevel(ft, sf) * 2, "", sf->addr);
ft->ft_lastaddr = sf->addr;
GetNestingLevel(ft, sf) * 2, "", fn);
ft->ft_lastaddr = fn;
}
ft->ft_noreentry = false;
}