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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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46
libc/str/strcspn.c
View file

@ -16,16 +16,8 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/pcmpeqb.h"
#include "libc/intrin/pmovmskb.h"
#include "libc/intrin/pshufd.h"
#include "libc/intrin/punpcklbw.h"
#include "libc/intrin/punpcklwd.h"
#include "libc/nexgen32e/hascharacter.internal.h"
#include "libc/str/str.h"
#define V(p) (void *)(p)
/**
* Returns prefix length, consisting of chars not in reject.
* a.k.a. Return index of first byte that's in charset.
@ -35,28 +27,24 @@
* @asyncsignalsafe
*/
size_t strcspn(const char *s, const char *reject) {
size_t i, n;
unsigned m;
char cv[16], sv[16];
if ((n = strlen(reject)) < 16) {
bzero(sv, 16);
memcpy(sv, reject, n);
for (i = 0;; ++i) {
cv[0] = s[i];
punpcklbw(V(cv), V(cv), V(cv));
punpcklwd(V(cv), V(cv), V(cv));
pshufd(V(cv), V(cv), 0);
pcmpeqb(V(cv), V(cv), V(sv));
if ((m = pmovmskb(V(cv)))) {
break;
}
}
return i;
int c;
size_t i;
bool lut[256];
#ifndef TINY
if (!reject[0]) {
return strlen(s);
}
for (i = 0; s[i]; ++i) {
if (HasCharacter(s[i], reject)) {
break;
if (!reject[1]) {
return strchrnul(s, reject[0]) - s;
}
#endif
bzero(lut, sizeof(lut));
do {
lut[(c = *reject++ & 255)] = true;
} while (c);
for (i = 0;; i++) {
if (lut[s[i] & 255]) {
return i;
}
}
return i;
}