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cosmopolitan/libc/calls/sigenter-xnu.c
Justine Tunney 9d372f48dd
Fix some issues
2023-10-09 20:19:09 -07:00

589 lines
18 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/sections.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/state.internal.h"
#include "libc/calls/struct/metasigaltstack.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/siginfo-xnu.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/ucontext.h"
#include "libc/intrin/repstosb.h"
#include "libc/log/libfatal.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/sa.h"
/**
* @fileoverview XNU kernel callback normalization.
*/
struct __darwin_mmst_reg {
char __mmst_reg[10];
char __mmst_rsrv[6];
};
struct __darwin_xmm_reg {
char __xmm_reg[16];
};
struct __darwin_ymm_reg {
char __ymm_reg[32];
};
struct __darwin_zmm_reg {
char __zmm_reg[64];
};
struct __darwin_opmask_reg {
char __opmask_reg[8];
};
struct __darwin_x86_thread_state64 {
uint64_t __rax;
uint64_t __rbx;
uint64_t __rcx;
uint64_t __rdx;
uint64_t __rdi;
uint64_t __rsi;
uint64_t __rbp;
uint64_t __rsp;
uint64_t __r8;
uint64_t __r9;
uint64_t __r10;
uint64_t __r11;
uint64_t __r12;
uint64_t __r13;
uint64_t __r14;
uint64_t __r15;
uint64_t __rip;
uint64_t __rflags;
uint64_t __cs;
uint64_t __fs;
uint64_t __gs;
};
struct __darwin_x86_thread_full_state64 {
struct __darwin_x86_thread_state64 ss64;
uint64_t __ds;
uint64_t __es;
uint64_t __ss;
uint64_t __gsbase;
};
struct __darwin_x86_float_state64 {
int32_t __fpu_reserved[2];
uint16_t __fpu_fcw;
uint16_t __fpu_fsw;
uint8_t __fpu_ftw;
uint8_t __fpu_rsrv1;
uint16_t __fpu_fop;
uint32_t __fpu_ip;
uint16_t __fpu_cs;
uint16_t __fpu_rsrv2;
uint32_t __fpu_dp;
uint16_t __fpu_ds;
uint16_t __fpu_rsrv3;
uint32_t __fpu_mxcsr;
uint32_t __fpu_mxcsrmask;
struct __darwin_mmst_reg __fpu_stmm0;
struct __darwin_mmst_reg __fpu_stmm1;
struct __darwin_mmst_reg __fpu_stmm2;
struct __darwin_mmst_reg __fpu_stmm3;
struct __darwin_mmst_reg __fpu_stmm4;
struct __darwin_mmst_reg __fpu_stmm5;
struct __darwin_mmst_reg __fpu_stmm6;
struct __darwin_mmst_reg __fpu_stmm7;
struct __darwin_xmm_reg __fpu_xmm0;
struct __darwin_xmm_reg __fpu_xmm1;
struct __darwin_xmm_reg __fpu_xmm2;
struct __darwin_xmm_reg __fpu_xmm3;
struct __darwin_xmm_reg __fpu_xmm4;
struct __darwin_xmm_reg __fpu_xmm5;
struct __darwin_xmm_reg __fpu_xmm6;
struct __darwin_xmm_reg __fpu_xmm7;
struct __darwin_xmm_reg __fpu_xmm8;
struct __darwin_xmm_reg __fpu_xmm9;
struct __darwin_xmm_reg __fpu_xmm10;
struct __darwin_xmm_reg __fpu_xmm11;
struct __darwin_xmm_reg __fpu_xmm12;
struct __darwin_xmm_reg __fpu_xmm13;
struct __darwin_xmm_reg __fpu_xmm14;
struct __darwin_xmm_reg __fpu_xmm15;
char __fpu_rsrv4[96];
int32_t __fpu_reserved1;
};
struct __darwin_x86_avx_state64 {
int32_t __fpu_reserved[2];
uint16_t __fpu_fcw;
uint16_t __fpu_fsw;
uint8_t __fpu_ftw;
uint8_t __fpu_rsrv1;
uint16_t __fpu_fop;
uint32_t __fpu_ip;
uint16_t __fpu_cs;
uint16_t __fpu_rsrv2;
uint32_t __fpu_dp;
uint16_t __fpu_ds;
uint16_t __fpu_rsrv3;
uint32_t __fpu_mxcsr;
uint32_t __fpu_mxcsrmask;
struct __darwin_mmst_reg __fpu_stmm0;
struct __darwin_mmst_reg __fpu_stmm1;
struct __darwin_mmst_reg __fpu_stmm2;
struct __darwin_mmst_reg __fpu_stmm3;
struct __darwin_mmst_reg __fpu_stmm4;
struct __darwin_mmst_reg __fpu_stmm5;
struct __darwin_mmst_reg __fpu_stmm6;
struct __darwin_mmst_reg __fpu_stmm7;
struct __darwin_xmm_reg __fpu_xmm0;
struct __darwin_xmm_reg __fpu_xmm1;
struct __darwin_xmm_reg __fpu_xmm2;
struct __darwin_xmm_reg __fpu_xmm3;
struct __darwin_xmm_reg __fpu_xmm4;
struct __darwin_xmm_reg __fpu_xmm5;
struct __darwin_xmm_reg __fpu_xmm6;
struct __darwin_xmm_reg __fpu_xmm7;
struct __darwin_xmm_reg __fpu_xmm8;
struct __darwin_xmm_reg __fpu_xmm9;
struct __darwin_xmm_reg __fpu_xmm10;
struct __darwin_xmm_reg __fpu_xmm11;
struct __darwin_xmm_reg __fpu_xmm12;
struct __darwin_xmm_reg __fpu_xmm13;
struct __darwin_xmm_reg __fpu_xmm14;
struct __darwin_xmm_reg __fpu_xmm15;
char __fpu_rsrv4[6 * 16];
int32_t __fpu_reserved1;
char __avx_reserved1[64];
struct __darwin_xmm_reg __fpu_ymmh0;
struct __darwin_xmm_reg __fpu_ymmh1;
struct __darwin_xmm_reg __fpu_ymmh2;
struct __darwin_xmm_reg __fpu_ymmh3;
struct __darwin_xmm_reg __fpu_ymmh4;
struct __darwin_xmm_reg __fpu_ymmh5;
struct __darwin_xmm_reg __fpu_ymmh6;
struct __darwin_xmm_reg __fpu_ymmh7;
struct __darwin_xmm_reg __fpu_ymmh8;
struct __darwin_xmm_reg __fpu_ymmh9;
struct __darwin_xmm_reg __fpu_ymmh10;
struct __darwin_xmm_reg __fpu_ymmh11;
struct __darwin_xmm_reg __fpu_ymmh12;
struct __darwin_xmm_reg __fpu_ymmh13;
struct __darwin_xmm_reg __fpu_ymmh14;
struct __darwin_xmm_reg __fpu_ymmh15;
};
struct __darwin_x86_avx512_state64 {
int32_t __fpu_reserved[2];
uint16_t __fpu_fcw;
uint16_t __fpu_fsw;
uint8_t __fpu_ftw;
uint8_t __fpu_rsrv1;
uint16_t __fpu_fop;
uint32_t __fpu_ip;
uint16_t __fpu_cs;
uint16_t __fpu_rsrv2;
uint32_t __fpu_dp;
uint16_t __fpu_ds;
uint16_t __fpu_rsrv3;
uint32_t __fpu_mxcsr;
uint32_t __fpu_mxcsrmask;
struct __darwin_mmst_reg __fpu_stmm0;
struct __darwin_mmst_reg __fpu_stmm1;
struct __darwin_mmst_reg __fpu_stmm2;
struct __darwin_mmst_reg __fpu_stmm3;
struct __darwin_mmst_reg __fpu_stmm4;
struct __darwin_mmst_reg __fpu_stmm5;
struct __darwin_mmst_reg __fpu_stmm6;
struct __darwin_mmst_reg __fpu_stmm7;
struct __darwin_xmm_reg __fpu_xmm0;
struct __darwin_xmm_reg __fpu_xmm1;
struct __darwin_xmm_reg __fpu_xmm2;
struct __darwin_xmm_reg __fpu_xmm3;
struct __darwin_xmm_reg __fpu_xmm4;
struct __darwin_xmm_reg __fpu_xmm5;
struct __darwin_xmm_reg __fpu_xmm6;
struct __darwin_xmm_reg __fpu_xmm7;
struct __darwin_xmm_reg __fpu_xmm8;
struct __darwin_xmm_reg __fpu_xmm9;
struct __darwin_xmm_reg __fpu_xmm10;
struct __darwin_xmm_reg __fpu_xmm11;
struct __darwin_xmm_reg __fpu_xmm12;
struct __darwin_xmm_reg __fpu_xmm13;
struct __darwin_xmm_reg __fpu_xmm14;
struct __darwin_xmm_reg __fpu_xmm15;
char __fpu_rsrv4[6 * 16];
int32_t __fpu_reserved1;
char __avx_reserved1[64];
struct __darwin_xmm_reg __fpu_ymmh0;
struct __darwin_xmm_reg __fpu_ymmh1;
struct __darwin_xmm_reg __fpu_ymmh2;
struct __darwin_xmm_reg __fpu_ymmh3;
struct __darwin_xmm_reg __fpu_ymmh4;
struct __darwin_xmm_reg __fpu_ymmh5;
struct __darwin_xmm_reg __fpu_ymmh6;
struct __darwin_xmm_reg __fpu_ymmh7;
struct __darwin_xmm_reg __fpu_ymmh8;
struct __darwin_xmm_reg __fpu_ymmh9;
struct __darwin_xmm_reg __fpu_ymmh10;
struct __darwin_xmm_reg __fpu_ymmh11;
struct __darwin_xmm_reg __fpu_ymmh12;
struct __darwin_xmm_reg __fpu_ymmh13;
struct __darwin_xmm_reg __fpu_ymmh14;
struct __darwin_xmm_reg __fpu_ymmh15;
struct __darwin_opmask_reg __fpu_k0;
struct __darwin_opmask_reg __fpu_k1;
struct __darwin_opmask_reg __fpu_k2;
struct __darwin_opmask_reg __fpu_k3;
struct __darwin_opmask_reg __fpu_k4;
struct __darwin_opmask_reg __fpu_k5;
struct __darwin_opmask_reg __fpu_k6;
struct __darwin_opmask_reg __fpu_k7;
struct __darwin_ymm_reg __fpu_zmmh0;
struct __darwin_ymm_reg __fpu_zmmh1;
struct __darwin_ymm_reg __fpu_zmmh2;
struct __darwin_ymm_reg __fpu_zmmh3;
struct __darwin_ymm_reg __fpu_zmmh4;
struct __darwin_ymm_reg __fpu_zmmh5;
struct __darwin_ymm_reg __fpu_zmmh6;
struct __darwin_ymm_reg __fpu_zmmh7;
struct __darwin_ymm_reg __fpu_zmmh8;
struct __darwin_ymm_reg __fpu_zmmh9;
struct __darwin_ymm_reg __fpu_zmmh10;
struct __darwin_ymm_reg __fpu_zmmh11;
struct __darwin_ymm_reg __fpu_zmmh12;
struct __darwin_ymm_reg __fpu_zmmh13;
struct __darwin_ymm_reg __fpu_zmmh14;
struct __darwin_ymm_reg __fpu_zmmh15;
struct __darwin_zmm_reg __fpu_zmm16;
struct __darwin_zmm_reg __fpu_zmm17;
struct __darwin_zmm_reg __fpu_zmm18;
struct __darwin_zmm_reg __fpu_zmm19;
struct __darwin_zmm_reg __fpu_zmm20;
struct __darwin_zmm_reg __fpu_zmm21;
struct __darwin_zmm_reg __fpu_zmm22;
struct __darwin_zmm_reg __fpu_zmm23;
struct __darwin_zmm_reg __fpu_zmm24;
struct __darwin_zmm_reg __fpu_zmm25;
struct __darwin_zmm_reg __fpu_zmm26;
struct __darwin_zmm_reg __fpu_zmm27;
struct __darwin_zmm_reg __fpu_zmm28;
struct __darwin_zmm_reg __fpu_zmm29;
struct __darwin_zmm_reg __fpu_zmm30;
struct __darwin_zmm_reg __fpu_zmm31;
};
struct __darwin_x86_exception_state64 {
uint16_t __trapno;
uint16_t __cpu;
uint32_t __err;
uint64_t __faultvaddr;
};
struct __darwin_x86_debug_state64 {
uint64_t __dr0;
uint64_t __dr1;
uint64_t __dr2;
uint64_t __dr3;
uint64_t __dr4;
uint64_t __dr5;
uint64_t __dr6;
uint64_t __dr7;
};
struct __darwin_x86_cpmu_state64 {
uint64_t __ctrs[16];
};
struct __darwin_mcontext64_full {
struct __darwin_x86_exception_state64 __es;
struct __darwin_x86_thread_full_state64 __ss;
struct __darwin_x86_float_state64 __fs;
};
struct __darwin_mcontext_avx64 {
struct __darwin_x86_exception_state64 __es;
struct __darwin_x86_thread_state64 __ss;
struct __darwin_x86_avx_state64 __fs;
};
struct __darwin_mcontext_avx64_full {
struct __darwin_x86_exception_state64 __es;
struct __darwin_x86_thread_full_state64 __ss;
struct __darwin_x86_avx_state64 __fs;
};
struct __darwin_mcontext_avx512_64 {
struct __darwin_x86_exception_state64 __es;
struct __darwin_x86_thread_state64 __ss;
struct __darwin_x86_avx512_state64 __fs;
};
struct __darwin_mcontext_avx512_64_full {
struct __darwin_x86_exception_state64 __es;
struct __darwin_x86_thread_full_state64 __ss;
struct __darwin_x86_avx512_state64 __fs;
};
struct __darwin_arm_exception_state64 {
uint64_t far;
uint32_t esr;
uint32_t exception;
};
struct __darwin_arm_thread_state64 {
uint64_t __x[29];
uint64_t __fp;
uint64_t __lr;
uint64_t __sp;
uint64_t __pc;
uint32_t __cpsr;
uint32_t __pad;
};
struct __darwin_arm_vfp_state {
uint32_t __r[64];
uint32_t __fpscr;
};
struct __darwin_mcontext64 {
#ifdef __x86_64__
struct __darwin_x86_exception_state64 __es;
struct __darwin_x86_thread_state64 __ss;
struct __darwin_x86_float_state64 __fs;
#elif defined(__aarch64__)
struct __darwin_arm_exception_state64 __es;
struct __darwin_arm_thread_state64 __ss;
struct __darwin_arm_vfp_state __fs;
#endif
};
struct __darwin_ucontext {
int32_t uc_onstack;
uint32_t uc_sigmask;
struct sigaltstack_bsd uc_stack;
struct __darwin_ucontext *uc_link;
uint64_t uc_mcsize;
struct __darwin_mcontext64 *uc_mcontext;
};
#ifdef __x86_64__
static privileged void xnuexceptionstate2linux(
mcontext_t *mc, struct __darwin_x86_exception_state64 *xnues) {
mc->trapno = xnues->__trapno;
mc->err = xnues->__err;
}
static privileged void linuxexceptionstate2xnu(
struct __darwin_x86_exception_state64 *xnues, mcontext_t *mc) {
xnues->__trapno = mc->trapno;
xnues->__err = mc->err;
}
static privileged void xnuthreadstate2linux(
mcontext_t *mc, struct __darwin_x86_thread_state64 *xnuss) {
mc->rdi = xnuss->__rdi;
mc->rsi = xnuss->__rsi;
mc->rbp = xnuss->__rbp;
mc->rbx = xnuss->__rbx;
mc->rdx = xnuss->__rdx;
mc->rax = xnuss->__rax;
mc->rcx = xnuss->__rcx;
mc->rsp = xnuss->__rsp;
mc->rip = xnuss->__rip;
mc->cs = xnuss->__cs;
mc->gs = xnuss->__gs;
mc->fs = xnuss->__fs;
mc->eflags = xnuss->__rflags;
mc->r8 = xnuss->__r8;
mc->r9 = xnuss->__r9;
mc->r10 = xnuss->__r10;
mc->r11 = xnuss->__r11;
mc->r12 = xnuss->__r12;
mc->r13 = xnuss->__r13;
mc->r14 = xnuss->__r14;
mc->r15 = xnuss->__r15;
}
static privileged void linuxthreadstate2xnu(
struct __darwin_x86_thread_state64 *xnuss, ucontext_t *uc, mcontext_t *mc) {
xnuss->__rdi = mc->rdi;
xnuss->__rsi = mc->rsi;
xnuss->__rbp = mc->rbp;
xnuss->__rbx = mc->rbx;
xnuss->__rdx = mc->rdx;
xnuss->__rax = mc->rax;
xnuss->__rcx = mc->rcx;
xnuss->__rsp = mc->rsp;
xnuss->__rip = mc->rip;
xnuss->__cs = mc->cs;
xnuss->__gs = mc->gs;
xnuss->__fs = mc->fs;
xnuss->__rflags = mc->eflags;
xnuss->__r8 = mc->r8;
xnuss->__r9 = mc->r9;
xnuss->__r10 = mc->r10;
xnuss->__r11 = mc->r11;
xnuss->__r12 = mc->r12;
xnuss->__r13 = mc->r13;
xnuss->__r14 = mc->r14;
xnuss->__r15 = mc->r15;
}
static privileged void CopyFpXmmRegs(void *d, const void *s) {
size_t i;
for (i = 0; i < (8 + 16) * 16; i += 16) {
__memcpy((char *)d + i, (const char *)s + i, 16);
}
}
static privileged void xnussefpustate2linux(
struct FpuState *fs, struct __darwin_x86_float_state64 *xnufs) {
fs->cwd = xnufs->__fpu_fcw;
fs->swd = xnufs->__fpu_fsw;
fs->ftw = xnufs->__fpu_ftw;
fs->fop = xnufs->__fpu_fop;
fs->rip = xnufs->__fpu_ip;
fs->rdp = xnufs->__fpu_dp;
fs->mxcsr = xnufs->__fpu_mxcsr;
fs->mxcr_mask = xnufs->__fpu_mxcsrmask;
CopyFpXmmRegs(fs->st, &xnufs->__fpu_stmm0);
}
static privileged void linuxssefpustate2xnu(
struct __darwin_x86_float_state64 *xnufs, struct FpuState *fs) {
xnufs->__fpu_fcw = fs->cwd;
xnufs->__fpu_fsw = fs->swd;
xnufs->__fpu_ftw = fs->ftw;
xnufs->__fpu_fop = fs->fop;
xnufs->__fpu_ip = fs->rip;
xnufs->__fpu_dp = fs->rdp;
xnufs->__fpu_mxcsr = fs->mxcsr;
xnufs->__fpu_mxcsrmask = fs->mxcr_mask;
CopyFpXmmRegs(&xnufs->__fpu_stmm0, fs->st);
}
#endif /* __x86_64__ */
#ifdef __x86_64__
privileged void __sigenter_xnu(void *fn, int infostyle, int sig,
struct siginfo_xnu *xnuinfo,
struct __darwin_ucontext *xnuctx) {
#else
privileged void __sigenter_xnu(int sig, struct siginfo_xnu *xnuinfo,
struct __darwin_ucontext *xnuctx) {
#endif
#pragma GCC push_options
#pragma GCC diagnostic ignored "-Wframe-larger-than="
struct Goodies {
ucontext_t uc;
siginfo_t si;
} g;
CheckLargeStackAllocation(&g, sizeof(g));
#pragma GCC pop_options
int rva, flags;
rva = __sighandrvas[sig];
if (rva >= kSigactionMinRva) {
flags = __sighandflags[sig];
if (~flags & SA_SIGINFO) {
((sigaction_f)(__executable_start + rva))(sig, 0, 0);
} else {
__repstosb(&g, 0, sizeof(g));
if (xnuctx) {
g.uc.uc_sigmask = xnuctx->uc_sigmask;
g.uc.uc_stack.ss_sp = xnuctx->uc_stack.ss_sp;
g.uc.uc_stack.ss_flags = xnuctx->uc_stack.ss_flags;
g.uc.uc_stack.ss_size = xnuctx->uc_stack.ss_size;
#ifdef __x86_64__
g.uc.uc_mcontext.fpregs = &g.uc.__fpustate;
if (xnuctx->uc_mcontext) {
if (xnuctx->uc_mcsize >=
sizeof(struct __darwin_x86_exception_state64)) {
xnuexceptionstate2linux(&g.uc.uc_mcontext,
&xnuctx->uc_mcontext->__es);
}
if (xnuctx->uc_mcsize >=
(sizeof(struct __darwin_x86_exception_state64) +
sizeof(struct __darwin_x86_thread_state64))) {
xnuthreadstate2linux(&g.uc.uc_mcontext, &xnuctx->uc_mcontext->__ss);
}
if (xnuctx->uc_mcsize >= sizeof(struct __darwin_mcontext64)) {
xnussefpustate2linux(&g.uc.__fpustate, &xnuctx->uc_mcontext->__fs);
}
}
#elif defined(__aarch64__)
if (xnuctx->uc_mcontext) {
__memcpy(g.uc.uc_mcontext.regs, &xnuctx->uc_mcontext->__ss.__x,
33 * 8);
}
#endif /* __x86_64__ */
}
if (xnuinfo) {
__siginfo2cosmo(&g.si, (void *)xnuinfo);
}
((sigaction_f)(__executable_start + rva))(sig, &g.si, &g.uc);
if (xnuctx) {
xnuctx->uc_stack.ss_sp = g.uc.uc_stack.ss_sp;
xnuctx->uc_stack.ss_flags = g.uc.uc_stack.ss_flags;
xnuctx->uc_stack.ss_size = g.uc.uc_stack.ss_size;
xnuctx->uc_sigmask = g.uc.uc_sigmask;
#ifdef __x86_64__
if (xnuctx->uc_mcontext) {
if (xnuctx->uc_mcsize >=
sizeof(struct __darwin_x86_exception_state64)) {
linuxexceptionstate2xnu(&xnuctx->uc_mcontext->__es,
&g.uc.uc_mcontext);
}
if (xnuctx->uc_mcsize >=
(sizeof(struct __darwin_x86_exception_state64) +
sizeof(struct __darwin_x86_thread_state64))) {
linuxthreadstate2xnu(&xnuctx->uc_mcontext->__ss, &g.uc,
&g.uc.uc_mcontext);
}
if (xnuctx->uc_mcsize >= sizeof(struct __darwin_mcontext64)) {
linuxssefpustate2xnu(&xnuctx->uc_mcontext->__fs, &g.uc.__fpustate);
}
}
#elif defined(__aarch64__)
if (xnuctx->uc_mcontext) {
__memcpy(&xnuctx->uc_mcontext->__ss.__x, g.uc.uc_mcontext.regs,
33 * 8);
}
#endif /* __x86_64__ */
}
}
}
#ifdef __x86_64__
intptr_t ax;
asm volatile("syscall"
: "=a"(ax)
: "0"(0x20000b8 /* sigreturn */), "D"(xnuctx), "S"(infostyle)
: "rcx", "r11", "memory", "cc");
notpossible;
#endif /* __x86_64__ */
}
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