Bananymous
2f9b8b6fc9
Kernel syscall API no longer zeros all unused argument registers and libc now uses inlined syscall macro internally. This significantly cleans up generated code for basic syscall wrapper functions.
35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
#pragma once
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#include <BAN/MacroUtils.h>
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#if defined(__x86_64__)
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#define _kas_instruction "syscall"
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#define _kas_result rax
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#define _kas_arguments rdi, rsi, rdx, r10, r8, r9
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#define _kas_globbers rcx, rdx, rdi, rsi, r8, r9, r10, r11
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#elif defined(__i686__)
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#define _kas_instruction "int $0xF0"
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#define _kas_result eax
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#define _kas_arguments eax, ebx, ecx, edx, esi, edi
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#define _kas_globbers
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#endif
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#define _kas_argument_var(index, value) register long _kas_a##index asm(_ban_stringify(_ban_get(index, _kas_arguments))) = (long)value;
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#define _kas_dummy_var(index, value) register long _kas_d##index asm(#value);
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#define _kas_input(index, _) "r"(_kas_a##index)
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#define _kas_output(index, _) , "=r"(_kas_d##index)
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#define _kas_globber(_, value) #value
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#define _kas_syscall(...) ({ \
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register long _kas_ret asm(_ban_stringify(_kas_result)); \
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_ban_for_each(_kas_argument_var, __VA_ARGS__) \
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_ban_for_each(_kas_dummy_var, _kas_globbers) \
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asm volatile( \
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_kas_instruction \
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: "=r"(_kas_ret) _ban_for_each(_kas_output, _kas_globbers) \
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: _ban_for_each_comma(_kas_input, __VA_ARGS__) \
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: "cc", "memory"); \
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(void)_kas_a0; /* require 1 argument */ \
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_kas_ret; \
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})
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