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379cd77078
On Windows, mmap() now chooses addresses transactionally. It reduces the risk of badness when interacting with the WIN32 memory manager. We don't throw darts anymore. There is also no more retry limit, since we recover from mystery maps more gracefully. The subroutine for combining adjacent maps has been rewritten for clarity. The print maps subroutine is better This change goes to great lengths to perfect the stack overflow code. On Windows you can now longjmp() out of a crash signal handler. Guard pages previously weren't being restored properly by the signal handler. That's fixed, so on Windows you can now handle a stack overflow multiple times. Great thought has been put into selecting the perfect SIGSTKSZ constants so you can save sigaltstack() memory. You can now use kprintf() with 512 bytes of stack available. The guard pages beneath the main stack are now recorded in the memory manager. This change fixes getcontext() so it works right with the %rax register.
64 lines
3.2 KiB
ArmAsm
64 lines
3.2 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│ vi: set noet ft=asm ts=8 sw=8 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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// Saves caller CPU state and signal mask.
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//
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// @param rdi points to sigjmp_buf
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// @param esi if non-zero will cause mask to be saved
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// @return eax 0 when set and !0 when longjmp'd
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// @returnstwice
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sigsetjmp:
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#ifdef __x86_64__
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test %esi,%esi
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jz setjmp
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popq 64(%rdi)
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mov %rbx,72(%rdi)
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mov %rdi,%rbx
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call setjmp
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pushq 64(%rbx)
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mov %rbx,%rdi
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mov %eax,%esi
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mov 72(%rdi),%rbx
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jmp __sigsetjmp_tail
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#elif defined(__aarch64__)
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cbz x1,setjmp
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str x30,[x0,#176]
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str x19,[x0,#176+8+8]
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mov x19,x0
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bl setjmp
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mov w1,w0
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mov x0,x19
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ldr x30,[x0,#176]
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ldr x19,[x0,#176+8+8]
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b __sigsetjmp_tail
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#else
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#error "unsupported architecture"
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#endif
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.hidden __sigsetjmp_tail
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.endfn sigsetjmp,globl
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