mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 14:23:09 +00:00
da018f9726
Whatever was in the frame pointer register prior to clone() will no longer be valid in the child process, so zero it to protect FP-based unwinders. Similarly, mark the link register as undefined to protect DWARF-based unwinders. This is only zeroing the frame pointer(s) on Arm/Thumb because of an LLVM assembler bug: https://github.com/llvm/llvm-project/issues/115891
399 lines
10 KiB
Zig
399 lines
10 KiB
Zig
const std = @import("../../std.zig");
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const maxInt = std.math.maxInt;
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const linux = std.os.linux;
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const SYS = linux.SYS;
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const socklen_t = linux.socklen_t;
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const iovec = std.posix.iovec;
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const iovec_const = std.posix.iovec_const;
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const uid_t = linux.uid_t;
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const gid_t = linux.gid_t;
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const pid_t = linux.pid_t;
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const sockaddr = linux.sockaddr;
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const timespec = linux.timespec;
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pub fn syscall0(number: SYS) usize {
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return asm volatile (
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\\ syscall
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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: "$1", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall_pipe(fd: *[2]i32) usize {
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return asm volatile (
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\\ .set noat
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\\ .set noreorder
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\\ syscall
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\\ beq $7, $zero, 1f
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\\ nop
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\\ b 2f
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\\ subu $2, $0, $2
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\\ 1:
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\\ sw $2, 0($4)
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\\ sw $3, 4($4)
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\\ 2:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(SYS.pipe)),
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[fd] "{$4}" (fd),
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: "$1", "$3", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall1(number: SYS, arg1: usize) usize {
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return asm volatile (
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\\ syscall
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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: "$1", "$3", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
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return asm volatile (
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\\ syscall
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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[arg2] "{$5}" (arg2),
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: "$1", "$3", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
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return asm volatile (
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\\ syscall
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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[arg2] "{$5}" (arg2),
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[arg3] "{$6}" (arg3),
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: "$1", "$3", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
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return asm volatile (
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\\ syscall
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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[arg2] "{$5}" (arg2),
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[arg3] "{$6}" (arg3),
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[arg4] "{$7}" (arg4),
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
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return asm volatile (
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\\ .set noat
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\\ subu $sp, $sp, 24
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\\ sw %[arg5], 16($sp)
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\\ syscall
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\\ addu $sp, $sp, 24
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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[arg2] "{$5}" (arg2),
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[arg3] "{$6}" (arg3),
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[arg4] "{$7}" (arg4),
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[arg5] "r" (arg5),
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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// NOTE: The o32 calling convention requires the callee to reserve 16 bytes for
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// the first four arguments even though they're passed in $a0-$a3.
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pub fn syscall6(
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number: SYS,
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arg1: usize,
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arg2: usize,
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arg3: usize,
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arg4: usize,
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arg5: usize,
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arg6: usize,
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) usize {
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return asm volatile (
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\\ .set noat
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\\ subu $sp, $sp, 24
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\\ sw %[arg5], 16($sp)
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\\ sw %[arg6], 20($sp)
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\\ syscall
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\\ addu $sp, $sp, 24
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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[arg2] "{$5}" (arg2),
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[arg3] "{$6}" (arg3),
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[arg4] "{$7}" (arg4),
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[arg5] "r" (arg5),
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[arg6] "r" (arg6),
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn syscall7(
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number: SYS,
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arg1: usize,
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arg2: usize,
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arg3: usize,
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arg4: usize,
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arg5: usize,
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arg6: usize,
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arg7: usize,
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) usize {
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return asm volatile (
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\\ .set noat
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\\ subu $sp, $sp, 32
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\\ sw %[arg5], 16($sp)
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\\ sw %[arg6], 20($sp)
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\\ sw %[arg7], 24($sp)
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\\ syscall
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\\ addu $sp, $sp, 32
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\\ beq $7, $zero, 1f
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\\ blez $2, 1f
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\\ subu $2, $0, $2
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\\ 1:
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: [ret] "={$2}" (-> usize),
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: [number] "{$2}" (@intFromEnum(number)),
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[arg1] "{$4}" (arg1),
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[arg2] "{$5}" (arg2),
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[arg3] "{$6}" (arg3),
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[arg4] "{$7}" (arg4),
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[arg5] "r" (arg5),
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[arg6] "r" (arg6),
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[arg7] "r" (arg7),
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn clone() callconv(.Naked) usize {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// 3, 4, 5, 6, 7, 8, 9
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//
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// 2 4, 5, 6, 7, 8
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asm volatile (
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\\ # Save function pointer and argument pointer on new thread stack
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\\ and $5, $5, -8
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\\ subu $5, $5, 16
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\\ sw $4, 0($5)
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\\ sw $7, 4($5)
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\\ # Shuffle (fn,sp,fl,arg,ptid,tls,ctid) to (fl,sp,ptid,tls,ctid)
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\\ move $4, $6
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\\ lw $6, 16($sp)
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\\ lw $7, 20($sp)
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\\ lw $9, 24($sp)
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\\ subu $sp, $sp, 16
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\\ sw $9, 16($sp)
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\\ li $2, 4120 # SYS_clone
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\\ syscall
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\\ beq $7, $0, 1f
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\\ nop
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\\ addu $sp, $sp, 16
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\\ jr $ra
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\\ subu $2, $0, $2
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\\1:
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\\ beq $2, $0, 1f
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\\ nop
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\\ addu $sp, $sp, 16
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\\ jr $ra
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\\ nop
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\\1:
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\\ .cfi_undefined $ra
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\\ move $fp, $zero
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\\ move $ra, $zero
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\\
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\\ lw $25, 0($sp)
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\\ lw $4, 4($sp)
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\\ jalr $25
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\\ nop
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\\ move $4, $2
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\\ li $2, 4001 # SYS_exit
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\\ syscall
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);
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}
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pub fn restore() callconv(.Naked) noreturn {
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asm volatile (
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\\ syscall
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:
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: [number] "{$2}" (@intFromEnum(SYS.sigreturn)),
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: "$1", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub fn restore_rt() callconv(.Naked) noreturn {
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asm volatile (
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\\ syscall
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:
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: [number] "{$2}" (@intFromEnum(SYS.rt_sigreturn)),
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: "$1", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "$25", "hi", "lo", "memory"
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);
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}
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pub const F = struct {
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pub const DUPFD = 0;
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pub const GETFD = 1;
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pub const SETFD = 2;
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pub const GETFL = 3;
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pub const SETFL = 4;
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pub const SETOWN = 24;
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pub const GETOWN = 23;
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pub const SETSIG = 10;
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pub const GETSIG = 11;
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pub const GETLK = 33;
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pub const SETLK = 34;
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pub const SETLKW = 35;
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pub const RDLCK = 0;
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pub const WRLCK = 1;
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pub const UNLCK = 2;
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pub const SETOWN_EX = 15;
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pub const GETOWN_EX = 16;
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pub const GETOWNER_UIDS = 17;
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};
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pub const MMAP2_UNIT = 4096;
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pub const VDSO = struct {
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pub const CGT_SYM = "__vdso_clock_gettime";
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pub const CGT_VER = "LINUX_2.6";
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};
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pub const Flock = extern struct {
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type: i16,
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whence: i16,
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__pad0: [4]u8,
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start: off_t,
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len: off_t,
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pid: pid_t,
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__unused: [4]u8,
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};
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pub const msghdr = extern struct {
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name: ?*sockaddr,
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namelen: socklen_t,
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iov: [*]iovec,
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iovlen: i32,
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control: ?*anyopaque,
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controllen: socklen_t,
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flags: i32,
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};
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pub const msghdr_const = extern struct {
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name: ?*const sockaddr,
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namelen: socklen_t,
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iov: [*]const iovec_const,
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iovlen: i32,
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control: ?*const anyopaque,
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controllen: socklen_t,
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flags: i32,
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};
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pub const blksize_t = u32;
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pub const nlink_t = u32;
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pub const time_t = i32;
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pub const mode_t = u32;
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pub const off_t = i64;
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pub const ino_t = u64;
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pub const dev_t = u64;
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pub const blkcnt_t = i64;
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// The `stat64` definition used by the Linux kernel.
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pub const Stat = extern struct {
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dev: dev_t,
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__pad0: [2]u32, // -1 because our dev_t is u64 (kernel dev_t is really u32).
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ino: ino_t,
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mode: mode_t,
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nlink: nlink_t,
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uid: uid_t,
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gid: gid_t,
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rdev: dev_t,
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__pad1: [2]u32, // -1 because our dev_t is u64 (kernel dev_t is really u32).
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size: off_t,
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atim: i32,
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atim_nsec: u32,
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mtim: i32,
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mtim_nsec: u32,
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ctim: i32,
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ctim_nsec: u32,
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blksize: blksize_t,
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__pad3: u32,
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blocks: blkcnt_t,
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pub fn atime(self: @This()) timespec {
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return .{
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.sec = self.atim,
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.nsec = self.atim_nsec,
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};
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}
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pub fn mtime(self: @This()) timespec {
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return .{
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.sec = self.mtim,
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.nsec = self.mtim_nsec,
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};
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}
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pub fn ctime(self: @This()) timespec {
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return .{
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.sec = self.ctim,
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.nsec = self.ctim_nsec,
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};
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}
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};
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pub const timeval = extern struct {
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sec: isize,
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usec: isize,
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};
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pub const timezone = extern struct {
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minuteswest: i32,
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dsttime: i32,
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};
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pub const Elf_Symndx = u32;
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/// TODO
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pub const ucontext_t = void;
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/// TODO
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pub const getcontext = {};
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