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1f2a5a8fc1
The ShowCrashReports() feature for aarch64 should work even better than the x86 crash reports. Thanks to the benefit of hindsight these reports should be rock solid reliable and beautiful to read. This change also improves the syscall polyfills for aarch64. Some of the sys_foo() functions have been removed, usually because they're legacy or downright footguns not worth building.
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#ifndef COSMOPOLITAN_LIBC_SYSV_MACROS_H_
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#define COSMOPOLITAN_LIBC_SYSV_MACROS_H_
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#include "libc/macros.internal.h"
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#ifdef __ASSEMBLER__
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/* clang-format off */
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/**
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* @fileoverview System Five jump slot generator.
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*
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* We need to pass a magic number to the SYSCALL instruction in %rax.
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* That's only possible to do in C using asm() macro wrappers, like in
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* Chromium's "System Call Support" library. This technique is simpler
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* to implement, gains us object-level ABI compatibility, hookability,
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* and the ability to support significantly more functions, without the
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* risk of slowing down builds too much with complicated headers.
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*/
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.macro .scall name:req amd:req arm:req kw1 kw2
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.section .text.syscall,"ax",@progbits
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#ifdef __x86_64__
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.ifnb \kw2
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.align 16
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\name: movabs $\amd,%rax
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jmp *__systemfive(%rip)
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.else
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\name: push %rbp
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mov %rsp,%rbp
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movabs $\amd,%rax
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.hookable
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call *__systemfive(%rip)
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pop %rbp
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ret
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.endif
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#elif defined(__aarch64__)
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\name:
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.ifc \arm,0xfff
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mov x0,#-38 // -ENOSYS
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.else
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mov x8,#\arm
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svc #0
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.endif
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b _sysret
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.hidden _sysret
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#else
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#error "architecture unsupported"
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#endif
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.endfn \name,\kw1,\kw2
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.previous
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.endm
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/* clang-format on */
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#endif /* __ASSEMBLER__ */
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#endif /* COSMOPOLITAN_LIBC_SYSV_MACROS_H_ */
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