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Perform more low-level code cleanup

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Justine Tunney 2022-09-09 04:07:08 -07:00
parent c32e2d4486
commit 2d17ab016c
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42 changed files with 977 additions and 265 deletions
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110
libc/calls/diagnose_syscall.S Normal file
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 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 "libc/macros.internal.h"
.privileged
diagnose_syscall:
push %rbp
mov %rsp,%rbp
push %rbx
push %r12
push %r13
push %r14
push %r15
mov $0x7fffffff,%eax
add $4,%eax # set sf/of/pf
mov %rdi,%rax # nr
mov %rsi,%rdi # arg 1
mov %rdx,%rsi # arg 2
mov %rcx,%rdx # arg 3
mov %r8,%r10 # arg 4
mov %r9,%r8 # arg 5
mov 16(%rbp),%r9 # arg 6
push 24(%rbp) # arg 7
push %rax # fake ret addr
mov 32(%rbp),%r12 # ucontext before
mov 40(%rbp),%r13 # ucontext after
xor %ecx,%ecx
xor %r11d,%r11d
mov $0x5555555555555555,%r11
mov $0x5555555555555555,%r14
mov $0x5555555555555555,%r15
mov $0x5555555555555555,%rbx
// save machine state before system call
pushf
pop 176(%r12)
mov %r8,40(%r12)
mov %r9,48(%r12)
mov %r10,56(%r12)
mov %r11,64(%r12)
mov %r12,72(%r12)
mov %r13,80(%r12)
mov %r14,88(%r12)
mov %r15,96(%r12)
mov %rdi,104(%r12)
mov %rsi,112(%r12)
mov %rbp,120(%r12)
mov %rbx,128(%r12)
mov %rdx,136(%r12)
mov %rax,144(%r12)
mov %rcx,152(%r12)
push %rbx
lea 320(%r12),%rbx
mov %rbx,224(%r12) # set fpregs ptr
pop %rbx
syscall
// save machine state after system call
pushf
pop 176(%r13)
mov %r8,40(%r13)
mov %r9,48(%r13)
mov %r10,56(%r13)
mov %r11,64(%r13)
mov %r12,72(%r13)
mov %r13,80(%r13)
mov %r14,88(%r13)
mov %r15,96(%r13)
mov %rdi,104(%r13)
mov %rsi,112(%r13)
mov %rbp,120(%r13)
mov %rbx,128(%r13)
mov %rdx,136(%r13)
mov %rax,144(%r13)
mov %rcx,152(%r13)
push %rbx
lea 320(%r13),%rbx
mov %rbx,224(%r13) # set fpregs ptr
pop %rbx
pop %r13
pop %r13
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbx
pop %rbp
ret
.endfn diagnose_syscall,globl