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https://codeberg.org/ziglang/zig.git
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std: make all MIPS inline asm safe for MIPS I
MIPS I has load hazards so we need to insert nops in a few places. This is not a problem for MIPS II and later. While doing this, I also touched up all the inline asm to use ABI register aliases and a consistent formatting convention. Also fixed a few places that didn't properly check if the syscall return value should be negated.
This commit is contained in:
Alex Rønne Petersen
parent
f3da54f53c
commit
b8d776928a
5 changed files with 223 additions and 232 deletions
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@ -5,9 +5,9 @@ const SYS = std.os.linux.SYS;
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pub fn syscall0(number: SYS) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -16,16 +16,14 @@ pub fn syscall0(number: SYS) u32 {
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pub fn syscall_pipe(fd: *[2]i32) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 2f
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\\ subu $v0, $zero, $v0
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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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\\ sw $v0, 0($a0)
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\\ sw $v1, 4($a0)
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\\2:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(SYS.pipe)),
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@ -36,9 +34,9 @@ pub fn syscall_pipe(fd: *[2]i32) u32 {
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pub fn syscall1(number: SYS, arg1: u32) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -49,9 +47,9 @@ pub fn syscall1(number: SYS, arg1: u32) u32 {
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pub fn syscall2(number: SYS, arg1: u32, arg2: u32) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -63,9 +61,9 @@ pub fn syscall2(number: SYS, arg1: u32, arg2: u32) u32 {
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pub fn syscall3(number: SYS, arg1: u32, arg2: u32, arg3: u32) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -78,9 +76,9 @@ pub fn syscall3(number: SYS, arg1: u32, arg2: u32, arg3: u32) u32 {
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pub fn syscall4(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -91,16 +89,18 @@ pub fn syscall4(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32) u32 {
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: .{ .r1 = true, .r3 = true, .r8 = true, .r9 = true, .r10 = true, .r11 = true, .r12 = true, .r13 = true, .r14 = true, .r15 = true, .r24 = true, .r25 = true, .hi = true, .lo = true, .memory = true });
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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 syscall5(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32, arg5: u32) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -112,9 +112,6 @@ pub fn syscall5(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32, arg5: u
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: .{ .r1 = true, .r3 = true, .r8 = true, .r9 = true, .r10 = true, .r11 = true, .r12 = true, .r13 = true, .r14 = true, .r15 = true, .r24 = true, .r25 = true, .hi = true, .lo = true, .memory = true });
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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: u32,
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@ -125,15 +122,14 @@ pub fn syscall6(
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arg6: u32,
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) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -157,16 +153,15 @@ pub fn syscall7(
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arg7: u32,
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) u32 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ subu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u32),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -182,37 +177,36 @@ pub fn syscall7(
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pub fn clone() callconv(.naked) u32 {
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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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// a0, a1, a2, a3, +0, +4, +8
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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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// v0 a0, a1, a2, a3, +0
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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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\\ and $a1, $a1, -8
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\\ subu $a1, $a1, 16
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\\ sw $a0, 0($a1)
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\\ sw $a3, 4($a1)
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\\
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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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\\ move $a0, $a2
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\\ lw $a2, 16($sp)
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\\ lw $a3, 20($sp)
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\\ lw $t1, 24($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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\\ sw $t1, 16($sp)
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\\ li $v0, 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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 2f
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\\ subu $v0, $zero, $v0
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\\ b 2f
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\\1:
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\\ beq $v0, $zero, 3f
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\\2:
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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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\\3:
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);
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if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
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\\ .cfi_undefined $ra
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@ -221,12 +215,12 @@ pub fn clone() callconv(.naked) u32 {
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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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\\ lw $t9, 0($sp)
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\\ lw $a0, 4($sp)
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\\ jalr $t9
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\\
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\\ move $a0, $v0
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\\ li $v0, 4001 # SYS_exit
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\\ syscall
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);
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}
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@ -5,9 +5,9 @@ const SYS = std.os.linux.SYS;
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pub fn syscall0(number: SYS) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -16,16 +16,14 @@ pub fn syscall0(number: SYS) u64 {
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pub fn syscall_pipe(fd: *[2]i32) u64 {
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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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\\ beq $a3, $zero, 1f
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\\ blez $v0, 2f
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\\ dsubu $v0, $zero, $v0
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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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\\ sw $v0, 0($a0)
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\\ sw $v1, 4($a0)
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\\2:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(SYS.pipe)),
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@ -36,10 +34,9 @@ pub fn syscall_pipe(fd: *[2]i32) u64 {
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pub fn syscall1(number: SYS, arg1: u64) u64 {
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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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\\ nop
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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -50,9 +47,9 @@ pub fn syscall1(number: SYS, arg1: u64) u64 {
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pub fn syscall2(number: SYS, arg1: u64, arg2: u64) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -64,9 +61,9 @@ pub fn syscall2(number: SYS, arg1: u64, arg2: u64) u64 {
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pub fn syscall3(number: SYS, arg1: u64, arg2: u64, arg3: u64) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -79,9 +76,9 @@ pub fn syscall3(number: SYS, arg1: u64, arg2: u64, arg3: u64) u64 {
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pub fn syscall4(number: SYS, arg1: u64, arg2: u64, arg3: u64, arg4: u64) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -95,9 +92,9 @@ pub fn syscall4(number: SYS, arg1: u64, arg2: u64, arg3: u64, arg4: u64) u64 {
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pub fn syscall5(number: SYS, arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -120,9 +117,9 @@ pub fn syscall6(
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) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -147,9 +144,9 @@ pub fn syscall7(
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) u64 {
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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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\\ dsubu $2, $0, $2
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\\ beq $a3, $zero, 1f
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\\ blez $v0, 1f
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\\ dsubu $v0, $zero, $v0
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\\1:
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: [ret] "={$2}" (-> u64),
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: [number] "{$2}" (@intFromEnum(number)),
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@ -165,33 +162,33 @@ pub fn syscall7(
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pub fn clone() callconv(.naked) u64 {
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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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// a0, a1, a2, a3, a4, a5, a6
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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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// v0 a0, a1, a2, a3, a4
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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, -16
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\\ dsubu $5, $5, 16
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\\ sd $4, 0($5)
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\\ sd $7, 8($5)
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\\ and $a1, $a1, -16
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\\ dsubu $a1, $a1, 16
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\\ sd $a0, 0($a1)
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\\ sd $a3, 8($a1)
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\\
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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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\\ move $6, $8
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\\ move $7, $9
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\\ move $8, $10
|
||||
\\ li $2, 5055 # SYS_clone
|
||||
\\ move $a0, $a2
|
||||
\\ move $a2, $a4
|
||||
\\ move $a3, $a5
|
||||
\\ move $a4, $a6
|
||||
\\ li $v0, 5055 # SYS_clone
|
||||
\\ syscall
|
||||
\\ beq $7, $0, 1f
|
||||
\\ nop
|
||||
\\ jr $ra
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 2f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\ b 2f
|
||||
\\1:
|
||||
\\ beq $2, $0, 1f
|
||||
\\ nop
|
||||
\\ beq $v0, $zero, 3f
|
||||
\\2:
|
||||
\\ jr $ra
|
||||
\\ nop
|
||||
\\1:
|
||||
\\3:
|
||||
);
|
||||
if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
|
||||
\\ .cfi_undefined $ra
|
||||
|
|
@ -200,12 +197,12 @@ pub fn clone() callconv(.naked) u64 {
|
|||
\\ move $fp, $zero
|
||||
\\ move $ra, $zero
|
||||
\\
|
||||
\\ ld $25, 0($sp)
|
||||
\\ ld $4, 8($sp)
|
||||
\\ jalr $25
|
||||
\\ nop
|
||||
\\ move $4, $2
|
||||
\\ li $2, 5058 # SYS_exit
|
||||
\\ ld $t9, 0($sp)
|
||||
\\ ld $a0, 8($sp)
|
||||
\\ jalr $t9
|
||||
\\
|
||||
\\ move $a0, $v0
|
||||
\\ li $v0, 5058 # SYS_exit
|
||||
\\ syscall
|
||||
);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -7,9 +7,9 @@ const SYS = std.os.linux.SYS;
|
|||
pub fn syscall0(number: SYS) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -18,16 +18,14 @@ pub fn syscall0(number: SYS) u32 {
|
|||
|
||||
pub fn syscall_pipe(fd: *[2]i32) u32 {
|
||||
return asm volatile (
|
||||
\\ .set noat
|
||||
\\ .set noreorder
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ nop
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 2f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\ b 2f
|
||||
\\ subu $2, $0, $2
|
||||
\\1:
|
||||
\\ sw $2, 0($4)
|
||||
\\ sw $3, 4($4)
|
||||
\\ sw $v0, 0($a0)
|
||||
\\ sw $v1, 4($a0)
|
||||
\\2:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(SYS.pipe)),
|
||||
|
|
@ -38,10 +36,9 @@ pub fn syscall_pipe(fd: *[2]i32) u32 {
|
|||
pub fn syscall1(number: SYS, arg1: u32) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ nop
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -52,9 +49,9 @@ pub fn syscall1(number: SYS, arg1: u32) u32 {
|
|||
pub fn syscall2(number: SYS, arg1: u32, arg2: u32) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -66,9 +63,9 @@ pub fn syscall2(number: SYS, arg1: u32, arg2: u32) u32 {
|
|||
pub fn syscall3(number: SYS, arg1: u32, arg2: u32, arg3: u32) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -81,9 +78,9 @@ pub fn syscall3(number: SYS, arg1: u32, arg2: u32, arg3: u32) u32 {
|
|||
pub fn syscall4(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -97,9 +94,9 @@ pub fn syscall4(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32) u32 {
|
|||
pub fn syscall5(number: SYS, arg1: u32, arg2: u32, arg3: u32, arg4: u32, arg5: u32) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -122,9 +119,9 @@ pub fn syscall6(
|
|||
) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -149,9 +146,9 @@ pub fn syscall7(
|
|||
) u32 {
|
||||
return asm volatile (
|
||||
\\ syscall
|
||||
\\ beq $7, $zero, 1f
|
||||
\\ blez $2, 1f
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 1f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\1:
|
||||
: [ret] "={$2}" (-> u32),
|
||||
: [number] "{$2}" (@intFromEnum(number)),
|
||||
|
|
@ -167,33 +164,33 @@ pub fn syscall7(
|
|||
|
||||
pub fn clone() callconv(.naked) u32 {
|
||||
// __clone(func, stack, flags, arg, ptid, tls, ctid)
|
||||
// 3, 4, 5, 6, 7, 8, 9
|
||||
// a0, a1, a2, a3, a4, a5, a6
|
||||
//
|
||||
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
|
||||
// 2 4, 5, 6, 7, 8
|
||||
// v0 a0, a1, a2, a3, a4
|
||||
asm volatile (
|
||||
\\ # Save function pointer and argument pointer on new thread stack
|
||||
\\ and $5, $5, -16
|
||||
\\ dsubu $5, $5, 16
|
||||
\\ sd $4, 0($5)
|
||||
\\ sd $7, 8($5)
|
||||
\\ and $a1, $a1, -16
|
||||
\\ dsubu $a1, $a1, 16
|
||||
\\ sd $a0, 0($a1)
|
||||
\\ sd $a3, 8($a1)
|
||||
\\
|
||||
\\ # Shuffle (fn,sp,fl,arg,ptid,tls,ctid) to (fl,sp,ptid,tls,ctid)
|
||||
\\ move $4, $6
|
||||
\\ move $6, $8
|
||||
\\ move $7, $9
|
||||
\\ move $8, $10
|
||||
\\ li $2, 5055 # SYS_clone
|
||||
\\ move $a0, $a2
|
||||
\\ move $a2, $a4
|
||||
\\ move $a3, $a5
|
||||
\\ move $a4, $a6
|
||||
\\ li $v0, 5055 # SYS_clone
|
||||
\\ syscall
|
||||
\\ beq $7, $0, 1f
|
||||
\\ nop
|
||||
\\ jr $ra
|
||||
\\ dsubu $2, $0, $2
|
||||
\\ beq $a3, $zero, 1f
|
||||
\\ blez $v0, 2f
|
||||
\\ dsubu $v0, $zero, $v0
|
||||
\\ b 2f
|
||||
\\1:
|
||||
\\ beq $2, $0, 1f
|
||||
\\ nop
|
||||
\\ beq $v0, $zero, 3f
|
||||
\\2:
|
||||
\\ jr $ra
|
||||
\\ nop
|
||||
\\1:
|
||||
\\3:
|
||||
);
|
||||
if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
|
||||
\\ .cfi_undefined $ra
|
||||
|
|
@ -202,12 +199,12 @@ pub fn clone() callconv(.naked) u32 {
|
|||
\\ move $fp, $zero
|
||||
\\ move $ra, $zero
|
||||
\\
|
||||
\\ ld $25, 0($sp)
|
||||
\\ ld $4, 8($sp)
|
||||
\\ jalr $25
|
||||
\\ nop
|
||||
\\ move $4, $2
|
||||
\\ li $2, 5058 # SYS_exit
|
||||
\\ ld $t9, 0($sp)
|
||||
\\ ld $a0, 8($sp)
|
||||
\\ jalr $t9
|
||||
\\
|
||||
\\ move $a0, $v0
|
||||
\\ li $v0, 5058 # SYS_exit
|
||||
\\ syscall
|
||||
);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -123,6 +123,7 @@ inline fn getDynamicSymbol() [*]const elf.Dyn {
|
|||
\\ .gpword _DYNAMIC
|
||||
\\1:
|
||||
\\ lw %[ret], 0($ra)
|
||||
\\ nop
|
||||
\\ addu %[ret], %[ret], $gp
|
||||
: [ret] "=r" (-> [*]const elf.Dyn),
|
||||
:
|
||||
|
|
|
|||
|
|
@ -325,24 +325,26 @@ fn _start() callconv(.naked) noreturn {
|
|||
\\ jsr (%%pc, %%a0)
|
||||
,
|
||||
.mips, .mipsel =>
|
||||
\\ move $fp, $0
|
||||
\\ move $fp, $zero
|
||||
\\ bal 1f
|
||||
\\ .gpword .
|
||||
\\ .gpword %[posixCallMainAndExit]
|
||||
\\1:
|
||||
// The `gp` register on MIPS serves a similar purpose to `r2` (ToC pointer) on PPC64.
|
||||
\\ lw $gp, 0($ra)
|
||||
\\ nop
|
||||
\\ subu $gp, $ra, $gp
|
||||
\\ lw $25, 4($ra)
|
||||
\\ addu $25, $25, $gp
|
||||
\\ move $ra, $0
|
||||
\\ lw $t9, 4($ra)
|
||||
\\ nop
|
||||
\\ addu $t9, $t9, $gp
|
||||
\\ move $ra, $zero
|
||||
\\ move $a0, $sp
|
||||
\\ and $sp, -8
|
||||
\\ subu $sp, $sp, 16
|
||||
\\ jalr $25
|
||||
\\ jalr $t9
|
||||
,
|
||||
.mips64, .mips64el =>
|
||||
\\ move $fp, $0
|
||||
\\ move $fp, $zero
|
||||
// This is needed because early MIPS versions don't support misaligned loads. Without
|
||||
// this directive, the hidden `nop` inserted to fill the delay slot after `bal` would
|
||||
// cause the two doublewords to be aligned to 4 bytes instead of 8.
|
||||
|
|
@ -354,13 +356,13 @@ fn _start() callconv(.naked) noreturn {
|
|||
// The `gp` register on MIPS serves a similar purpose to `r2` (ToC pointer) on PPC64.
|
||||
\\ ld $gp, 0($ra)
|
||||
\\ dsubu $gp, $ra, $gp
|
||||
\\ ld $25, 8($ra)
|
||||
\\ daddu $25, $25, $gp
|
||||
\\ move $ra, $0
|
||||
\\ ld $t9, 8($ra)
|
||||
\\ daddu $t9, $t9, $gp
|
||||
\\ move $ra, $zero
|
||||
\\ move $a0, $sp
|
||||
\\ and $sp, -16
|
||||
\\ dsubu $sp, $sp, 16
|
||||
\\ jalr $25
|
||||
\\ jalr $t9
|
||||
,
|
||||
.powerpc, .powerpcle =>
|
||||
// Set up the initial stack frame, and clear the back chain pointer.
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue