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https://github.com/jart/cosmopolitan.git
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Perform more low-level code cleanup
This commit is contained in:
Justine Tunney
parent
c32e2d4486
commit
2d17ab016c
42 changed files with 977 additions and 265 deletions
110
libc/calls/diagnose_syscall.S
Normal file
110
libc/calls/diagnose_syscall.S
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@ -0,0 +1,110 @@
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/*-*- 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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@ -20,10 +20,26 @@
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// Gets machine state.
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//
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// @note please use longerjmp() and setlongerjmp() for fibers
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// @note currently only gets general registers
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// @see setcontext()
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getcontext:
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pushf
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pop 176(%rdi)
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movaps %xmm0,480(%rdi)
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movaps %xmm1,496(%rdi)
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movaps %xmm2,512(%rdi)
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movaps %xmm3,528(%rdi)
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movaps %xmm4,544(%rdi)
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movaps %xmm5,560(%rdi)
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movaps %xmm6,576(%rdi)
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movaps %xmm7,592(%rdi)
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movaps %xmm8,608(%rdi)
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movaps %xmm9,624(%rdi)
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movaps %xmm10,640(%rdi)
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movaps %xmm11,656(%rdi)
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movaps %xmm12,672(%rdi)
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movaps %xmm13,688(%rdi)
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movaps %xmm14,704(%rdi)
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movaps %xmm15,720(%rdi)
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mov %r8,40(%rdi)
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mov %r9,48(%rdi)
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mov %r10,56(%rdi)
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@ -39,6 +55,8 @@ getcontext:
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mov %rdx,136(%rdi)
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mov %rax,144(%rdi)
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mov %rcx,152(%rdi)
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lea 320(%rdi),%rax
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mov %rax,224(%rdi)
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lea 8(%rsp),%rax
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mov %rax,160(%rdi)
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mov (%rsp),%rax
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@ -50,6 +68,22 @@ getcontext:
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.end
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////////////////////////////////////////////////////////////////////////////////
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noasan noubsan noinstrument int getcontext(ucontext_t *uc) {
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asm volatile("movaps\t%%xmm0,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[0]));
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asm volatile("movaps\t%%xmm1,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[1]));
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asm volatile("movaps\t%%xmm2,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[2]));
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asm volatile("movaps\t%%xmm3,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[3]));
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asm volatile("movaps\t%%xmm4,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[4]));
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asm volatile("movaps\t%%xmm5,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[5]));
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asm volatile("movaps\t%%xmm6,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[6]));
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asm volatile("movaps\t%%xmm7,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[7]));
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asm volatile("movaps\t%%xmm8,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[8]));
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asm volatile("movaps\t%%xmm9,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[9]));
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asm volatile("movaps\t%%xmm10,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[10]));
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asm volatile("movaps\t%%xmm11,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[11]));
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asm volatile("movaps\t%%xmm12,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[12]));
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asm volatile("movaps\t%%xmm13,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[13]));
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asm volatile("movaps\t%%xmm14,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[14]));
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asm volatile("movaps\t%%xmm15,%0" : /* no outputs */ : "m"(uc->__fpustate.xmm[15]));
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asm volatile("mov\t%%r8,%0" : "=m"(uc->uc_mcontext.r8));
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asm volatile("mov\t%%r9,%0" : "=m"(uc->uc_mcontext.r9));
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asm volatile("mov\t%%r10,%0" : "=m"(uc->uc_mcontext.r10));
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@ -65,6 +99,7 @@ noasan noubsan noinstrument int getcontext(ucontext_t *uc) {
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asm volatile("mov\t%%rdx,%0" : "=m"(uc->uc_mcontext.rdx));
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asm volatile("mov\t%%rax,%0" : "=m"(uc->uc_mcontext.rax));
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asm volatile("mov\t%%rcx,%0" : "=m"(uc->uc_mcontext.rcx));
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uc->uc_mcontext.fpregs = &uc->__fpustate;
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asm volatile("lea\t8(%%rsp),%%rax\n\t"
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"mov\t%%rax,%0"
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: "=m"(uc->uc_mcontext.rsp)
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@ -20,10 +20,29 @@
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// Sets machine state.
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//
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// @note please use longerjmp() and setlongerjmp() for fibers
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// @note currently only sets general registers
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// @see getcontext()
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setcontext:
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mov 224(%rdi),%rax
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test %rax,%rax
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je 1f
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movaps 160(%rax),%xmm0
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movaps 176(%rax),%xmm1
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movaps 192(%rax),%xmm2
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movaps 208(%rax),%xmm3
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movaps 224(%rax),%xmm4
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movaps 240(%rax),%xmm5
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movaps 256(%rax),%xmm6
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movaps 272(%rax),%xmm7
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movaps 288(%rax),%xmm8
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movaps 304(%rax),%xmm9
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movaps 320(%rax),%xmm10
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movaps 336(%rax),%xmm11
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movaps 352(%rax),%xmm12
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movaps 368(%rax),%xmm13
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movaps 384(%rax),%xmm14
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movaps 400(%rax),%xmm15
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1: push 176(%rdi)
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popf
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mov 40(%rdi),%r8
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mov 48(%rdi),%r9
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mov 56(%rdi),%r10
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@ -48,6 +67,24 @@ setcontext:
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.end
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////////////////////////////////////////////////////////////////////////////////
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noasan noubsan int setcontext(const ucontext_t *uc) {
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if (uc->uc_mcontext.fpregs) {
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asm volatile("movaps\t%0,%%xmm0" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[0]));
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asm volatile("movaps\t%0,%%xmm1" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[1]));
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asm volatile("movaps\t%0,%%xmm2" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[2]));
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asm volatile("movaps\t%0,%%xmm3" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[3]));
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asm volatile("movaps\t%0,%%xmm4" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[4]));
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asm volatile("movaps\t%0,%%xmm5" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[5]));
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asm volatile("movaps\t%0,%%xmm6" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[6]));
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asm volatile("movaps\t%0,%%xmm7" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[7]));
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asm volatile("movaps\t%0,%%xmm8" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[8]));
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asm volatile("movaps\t%0,%%xmm9" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[9]));
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asm volatile("movaps\t%0,%%xmm10" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[10]));
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asm volatile("movaps\t%0,%%xmm11" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[11]));
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asm volatile("movaps\t%0,%%xmm12" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[12]));
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asm volatile("movaps\t%0,%%xmm13" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[13]));
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asm volatile("movaps\t%0,%%xmm14" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[14]));
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asm volatile("movaps\t%0,%%xmm15" : /* no outputs */ : "m"(uc->uc_mcontext.fpregs->xmm[15]));
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}
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asm volatile("mov\t%0,%%r8" : /* no outputs */ : "m"(uc->uc_mcontext.r8));
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asm volatile("mov\t%0,%%r9" : /* no outputs */ : "m"(uc->uc_mcontext.r9));
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asm volatile("mov\t%0,%%r10" : /* no outputs */ : "m"(uc->uc_mcontext.r10));
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@ -1,9 +1,9 @@
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#ifndef COSMOPOLITAN_LIBC_CALLS_STRUCT_UCONTEXT_NETBSD_INTERNAL_H_
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#define COSMOPOLITAN_LIBC_CALLS_STRUCT_UCONTEXT_NETBSD_INTERNAL_H_
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#include "libc/calls/ucontext.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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// clang-format off
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#include "libc/calls/ucontext.h"
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#define __UCONTEXT_SIZE 784
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#define _UC_SIGMASK 0x01
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@ -65,7 +65,7 @@ struct MachineContext {
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};
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gregset_t gregs;
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};
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struct FpuState *fpregs;
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struct FpuState *fpregs; /* zero when no fpu context */
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uint64_t __pad1[8];
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};
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@ -77,6 +77,7 @@ struct ucontext {
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stack_t uc_stack;
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mcontext_t uc_mcontext; /* use this */
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sigset_t uc_sigmask;
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uint64_t __pad;
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struct FpuState __fpustate; /* for cosmo on non-linux */
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};
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