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std.debug.cpu_context: let the compiler deal with clobbers

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Otherwise we might be restoring registers we don't even need to.
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Alex Rønne Petersen 2025-10-16 18:54:38 +02:00
parent 1f15e265fe
commit 727942bc03
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1 changed files with 8 additions and 21 deletions
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29
lib/std/debug/cpu_context.zig
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@ -242,10 +242,9 @@ const Aarch64 = extern struct {
\\ str x1, [x0, #0x0f8]
\\ adr x1, .
\\ str x1, [x0, #0x100]
\\ ldr x1, [x0, #0x008]
:
: [ctx] "{x0}" (&ctx),
: .{ .memory = true });
: .{ .x1 = true, .memory = true });
return ctx;
}
@ -469,10 +468,9 @@ const Hexagon = extern struct {
\\ memw(r0 + #124) = r31
\\ r1 = pc
\\ memw(r0 + #128) = r1
\\ r1 = memw(r0 + #4)
:
: [ctx] "{r0}" (&ctx),
: .{ .memory = true });
: .{ .r1 = true, .memory = true });
return ctx;
}
@ -594,7 +592,6 @@ const LoongArch = extern struct {
\\ bl 1f
\\1:
\\ st.d $ra, $t0, 256
\\ ld.d $ra, $t0, 8
else
\\ st.w $zero, $t0, 0
\\ st.w $ra, $t0, 4
@ -631,10 +628,9 @@ const LoongArch = extern struct {
\\ bl 1f
\\1:
\\ st.w $ra, $t0, 128
\\ ld.w $ra, $t0, 4
:
: [ctx] "{$r12}" (&ctx),
: .{ .memory = true });
: .{ .r1 = true, .memory = true });
return ctx;
}
@ -734,7 +730,6 @@ const Mips = extern struct {
\\ bal 1f
\\1:
\\ sd $ra, 256($t0)
\\ ld $ra, 248($t0)
\\ .set pop
else
\\ .set push
@ -776,11 +771,10 @@ const Mips = extern struct {
\\ bal 1f
\\1:
\\ sw $ra, 128($t4)
\\ lw $ra, 124($t4)
\\ .set pop
:
: [ctx] "{$12}" (&ctx),
: .{ .memory = true });
: .{ .r31 = true, .memory = true });
return ctx;
}
@ -916,7 +910,6 @@ const Powerpc = extern struct {
\\1:
\\ mflr 8
\\ std 8, 256(10)
\\ ld 8, 64(10)
else
\\ stw 0, 0(10)
\\ stw 1, 4(10)
@ -956,10 +949,9 @@ const Powerpc = extern struct {
\\1:
\\ mflr 8
\\ stw 8, 128(10)
\\ lwz 8, 32(10)
:
: [ctx] "{r10}" (&ctx),
: .{ .lr = true, .memory = true });
: .{ .r8 = true, .lr = true, .memory = true });
return ctx;
}
@ -1068,7 +1060,6 @@ const Riscv = extern struct {
\\ jal ra, 1f
\\1:
\\ sd ra, 256(t0)
\\ ld ra, 8(t0)
else
\\ sw zero, 0(t0)
\\ sw ra, 4(t0)
@ -1105,10 +1096,9 @@ const Riscv = extern struct {
\\ jal ra, 1f
\\1:
\\ sw ra, 128(t0)
\\ lw ra, 4(t0)
:
: [ctx] "{t0}" (&ctx),
: .{ .memory = true });
: .{ .x1 = true, .memory = true });
return ctx;
}
@ -1146,11 +1136,9 @@ const S390x = extern struct {
\\ stm %%r0, %%r1, 128(%%r2)
\\ larl %%r0, .
\\ stg %%r0, 136(%%r2)
\\ lg %%r0, 0(%%r2)
\\ lg %%r1, 8(%%r2)
:
: [ctx] "{r2}" (&ctx),
: .{ .memory = true });
: .{ .r0 = true, .r1 = true, .memory = true });
return ctx;
}
@ -1458,10 +1446,9 @@ const X86_64 = struct {
\\ movq %%r15, 0x78(%%rdi)
\\ leaq (%%rip), %%rax
\\ movq %%rax, 0x80(%%rdi)
\\ movq 0x00(%%rdi), %%rax
:
: [gprs] "{rdi}" (&ctx.gprs.values),
: .{ .memory = true });
: .{ .rax = true, .memory = true });
return ctx;
}