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61c581baeb
Linux is in the unfortunate situation where the system call number is architecture specific. This consolidates the system call number definitions in a single location, adds some wrappers, and hopefully fixes the existing non-portable invocations of the syscall intrinsic.
61 lines
1.8 KiB
Odin
61 lines
1.8 KiB
Odin
package unix
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import "core:intrinsics"
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// Linux has inconsistent system call numbering across architectures,
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// for largely historical reasons. This attempts to provide a unified
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// Odin-side interface for system calls that are required for the core
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// library to work.
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// For authorative system call numbers, the following files in the kernel
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// source can be used:
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//
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// amd64: arch/x86/entry/syscalls/syscall_64.tbl
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// arm64: include/uapi/asm-generic/unistd.h
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// 386: arch/x86/entry/syscalls/sycall_32.tbl
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// arm: arch/arm/tools/syscall.tbl
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when ODIN_ARCH == "amd64" {
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SYS_mmap : uintptr : 9
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SYS_mprotect : uintptr : 10
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SYS_munmap : uintptr : 11
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SYS_madvise : uintptr : 28
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SYS_futex : uintptr : 202
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SYS_gettid : uintptr : 186
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SYS_getrandom : uintptr : 318
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} else when ODIN_ARCH == "arm64" {
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SYS_mmap : uintptr : 222
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SYS_mprotect : uintptr : 226
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SYS_munmap : uintptr : 215
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SYS_madvise : uintptr : 233
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SYS_futex : uintptr : 98
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SYS_gettid : uintptr : 178
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SYS_getrandom : uintptr : 278
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} else when ODIN_ARCH == "386" {
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SYS_mmap : uintptr : 192 // 90 is "sys_old_mmap", we want mmap2
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SYS_mprotect : uintptr : 125
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SYS_munmap : uintptr : 91
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SYS_madvise : uintptr : 219
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SYS_futex : uintptr : 240
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SYS_gettid : uintptr : 224
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SYS_getrandom : uintptr : 355
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} else when ODIN_ARCH == "arm" {
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SYS_mmap : uintptr : 192 // 90 is "sys_old_mmap", we want mmap2
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SYS_mprotect : uintptr : 125
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SYS_munmap: uintptr : 91
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SYS_madvise: uintptr : 220
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SYS_futex : uintptr : 240
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SYS_gettid : uintptr: 224
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SYS_getrandom : uintptr : 384
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} else {
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#panic("Unsupported architecture")
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}
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sys_gettid :: proc "contextless" () -> int {
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return cast(int)intrinsics.syscall(SYS_gettid)
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}
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sys_getrandom :: proc "contextless" (buf: ^byte, buflen: int, flags: uint) -> int {
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return cast(int)intrinsics.syscall(SYS_getrandom, buf, cast(uintptr)(buflen), cast(uintptr)(flags))
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}
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