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ARM64: Add support for ARM64e pointer authentication codes (PAC).

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Contributed by Peter Cawley. #559
This commit is contained in:
Mike Pall
2023-08-12 22:25:40 +02:00
parent 117ddf35e6
commit 27af72e66f
15 changed files with 118 additions and 33 deletions
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12
src/lj_emit_arm64.h
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@@ -348,16 +348,22 @@ static void emit_cnb(ASMState *as, A64Ins ai, Reg r, MCode *target)
#define emit_jmp(as, target) emit_branch(as, A64I_B, (target))
static void emit_call(ASMState *as, void *target)
static void emit_call(ASMState *as, ASMFunction target)
{
MCode *p = --as->mcp;
ptrdiff_t delta = (char *)target - (char *)p;
#if LJ_ABI_PAUTH
char *targetp = ptrauth_auth_data((char *)target,
ptrauth_key_function_pointer, 0);
#else
char *targetp = (char *)target;
#endif
ptrdiff_t delta = targetp - (char *)p;
if (A64F_S_OK(delta>>2, 26)) {
*p = A64I_BL | A64F_S26(delta>>2);
} else { /* Target out of range: need indirect call. But don't use R0-R7. */
Reg r = ra_allock(as, i64ptr(target),
RSET_RANGE(RID_X8, RID_MAX_GPR)-RSET_FIXED);
*p = A64I_BLR | A64F_N(r);
*p = A64I_BLR_AUTH | A64F_N(r);
}
}