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Get setcontext() and getcontext() working on Aarch64

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This change also adds the missing code for getting and restoring the
thread's signal mask, since that's explicitly listed by the man page
This commit is contained in:
Justine Tunney 2023-07-01 22:42:58 -07:00
parent 8b62bff364
commit 7ec84655b4
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GPG key ID: BE714B4575D6E328
7 changed files with 182 additions and 13 deletions
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41
libc/calls/getcontext.S
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@ -22,6 +22,8 @@
//
// @see setcontext()
getcontext:
#ifdef __x86_64__
pushf
pop 176(%rdi)
movaps %xmm0,480(%rdi)
@ -61,12 +63,39 @@ getcontext:
mov %rax,160(%rdi)
mov (%rsp),%rax
mov %rax,168(%rdi)
xor %eax,%eax
ret
jmp __getcontext
#elif defined(__aarch64__)
stp x0,x1,[x0,184]
stp x2,x3,[x0,200]
stp x4,x5,[x0,216]
stp x6,x7,[x0,232]
stp x8,x9,[x0,248]
stp x10,x11,[x0,264]
stp x12,x13,[x0,280]
stp x14,x15,[x0,296]
stp x16,x17,[x0,312]
stp x18,x19,[x0,328]
stp x20,x21,[x0,344]
stp x22,x23,[x0,360]
stp x24,x25,[x0,376]
stp x26,x27,[x0,392]
stp x28,x29,[x0,408]
str x30,[x0,424]
mov x1,sp
str x1,[x0,432] // sp = caller's sp
str x30,[x0,440] // pc = caller's pc
b __getcontext
#else
#error "unsupported architecture"
#endif
.endfn getcontext,globl
.end
////////////////////////////////////////////////////////////////////////////////
noasan noubsan dontinstrument int getcontext(ucontext_t *uc) {
asm volatile("movaps\t%%xmm0,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[0]));
asm volatile("movaps\t%%xmm1,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[1]));
@ -112,3 +141,11 @@ noasan noubsan dontinstrument int getcontext(ucontext_t *uc) {
: "rax");
return 0;
}
noasan noubsan dontinstrument int getcontext(ucontext_t *uc) {
asm volatile("stp\tx0,x1,%0" : "=m"(uc->uc_mcontext.regs[0]));
asm volatile("stp\tx2,x3,%0" : "=m"(uc->uc_mcontext.regs[2]));
asm volatile("mov\tx1,sp\n\tstr\tx1,%0" : "=m"(uc->uc_mcontext.sp));
asm volatile("str\tx30,%0" : "=m"(uc->uc_mcontext.pc));
return 0;
}