mirror of
https://github.com/jart/cosmopolitan.git
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110 lines
3.4 KiB
ArmAsm
110 lines
3.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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.privileged
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diagnose_syscall:
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push %rbp
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mov %rsp,%rbp
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push %rbx
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push %r12
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push %r13
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push %r14
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push %r15
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mov $0x7fffffff,%eax
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add $4,%eax # set sf/of/pf
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mov %rdi,%rax # nr
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mov %rsi,%rdi # arg 1
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mov %rdx,%rsi # arg 2
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mov %rcx,%rdx # arg 3
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mov %r8,%r10 # arg 4
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mov %r9,%r8 # arg 5
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mov 16(%rbp),%r9 # arg 6
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push 24(%rbp) # arg 7
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push %rax # fake ret addr
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mov 32(%rbp),%r12 # ucontext before
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mov 40(%rbp),%r13 # ucontext after
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xor %ecx,%ecx
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xor %r11d,%r11d
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mov $0x5555555555555555,%r11
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mov $0x5555555555555555,%r14
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mov $0x5555555555555555,%r15
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mov $0x5555555555555555,%rbx
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// save machine state before system call
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pushf
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pop 176(%r12)
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mov %r8,40(%r12)
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mov %r9,48(%r12)
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mov %r10,56(%r12)
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mov %r11,64(%r12)
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mov %r12,72(%r12)
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mov %r13,80(%r12)
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mov %r14,88(%r12)
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mov %r15,96(%r12)
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mov %rdi,104(%r12)
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mov %rsi,112(%r12)
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mov %rbp,120(%r12)
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mov %rbx,128(%r12)
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mov %rdx,136(%r12)
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mov %rax,144(%r12)
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mov %rcx,152(%r12)
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push %rbx
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lea 320(%r12),%rbx
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mov %rbx,224(%r12) # set fpregs ptr
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pop %rbx
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syscall
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// save machine state after system call
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pushf
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pop 176(%r13)
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mov %r8,40(%r13)
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mov %r9,48(%r13)
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mov %r10,56(%r13)
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mov %r11,64(%r13)
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mov %r12,72(%r13)
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mov %r13,80(%r13)
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mov %r14,88(%r13)
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mov %r15,96(%r13)
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mov %rdi,104(%r13)
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mov %rsi,112(%r13)
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mov %rbp,120(%r13)
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mov %rbx,128(%r13)
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mov %rdx,136(%r13)
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mov %rax,144(%r13)
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mov %rcx,152(%r13)
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push %rbx
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lea 320(%r13),%rbx
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mov %rbx,224(%r13) # set fpregs ptr
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pop %rbx
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pop %r13
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pop %r13
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pop %r15
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pop %r14
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pop %r13
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pop %r12
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pop %rbx
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pop %rbp
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ret
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.endfn diagnose_syscall,globl
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