d0f7acf9eb
An x86-64 operating system built from xv6, now largely rewritten: SMP, a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF rasteriser, and a Linux-numbered syscall ABI. No history before this point -- the tree was never under version control. This commit exists so the rename that follows has something to undo to.
33 lines
1.4 KiB
C
33 lines
1.4 KiB
C
// SPDX-License-Identifier: Apache-2.0
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// Linux x86_64 syscall number -> Schunix syscall number translation.
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// Enabled per process by sys_enable_linux_abi (see kernel/sys/sys_compat.c).
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//
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// This file used to be the second half of a two-place registration scheme: a
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// hand-written `#define LINUX_foo N` for every Linux number, plus a hand-written
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// map entry pointing it at SYS_foo. Adding a syscall meant three edits across
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// two files, and forgetting this one left the syscall unreachable from every
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// musl-linked program while looking perfectly registered in table.inc.
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//
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// The map is now generated from kernel/sys/table.inc, which carries the Linux
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// number alongside the native one. There is nothing to hand-edit here.
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#include "types.h"
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#include "syscall.h"
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#define LINUX_NSYSCALL NSYSCALLS
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// Index: Linux x86_64 syscall number. Value: Schunix SYS_* number, or 0 for
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// "not implemented" (syscall() then returns -ENOSYS).
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//
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// Syscalls declared NO_LINUX in table.inc all land on the single scratch index
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// NO_LINUX. They overwrite each other there, which is harmless: no real Linux
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// syscall uses that number, so the slot is never dispatched.
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int linux_syscall_map[LINUX_NSYSCALL] = {
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#define SYSCALL(nr, lnr, name) [lnr] = SYS_##name,
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#define SYSCALL_ALIAS(lnr, name) [lnr] = SYS_##name,
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#include "table.inc"
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#undef SYSCALL
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#undef SYSCALL_ALIAS
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};
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int linux_syscall_map_size = LINUX_NSYSCALL;
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