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std.debug.cpu_context: remove support for s390x float registers

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Let's for the moment assume that compilers haven't lost the plot.

Fingers crossed.
This commit is contained in:
Alex Rønne Petersen 2025-10-07 00:50:29 +02:00
parent 9cd37a0696
commit de3b22db4d
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1 changed files with 3 additions and 38 deletions
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41
lib/std/debug/cpu_context.zig
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@ -239,7 +239,6 @@ pub fn fromPosixSignalContext(ctx_ptr: ?*const anyopaque) ?Native {
.s390x => switch (builtin.os.tag) {
.linux => .{
.r = uc.mcontext.gregs,
.f = uc.mcontext.fregs,
.psw = .{
.mask = uc.mcontext.psw.mask,
.addr = uc.mcontext.psw.addr,
@ -1029,8 +1028,6 @@ pub const Riscv = extern struct {
pub const S390x = extern struct {
/// The numbered general-purpose registers r0 - r15.
r: [16]u64,
/// The numbered floating-point registers f0 - f15. Yes, really - they can be used in DWARF CFI.
f: [16]f64,
/// The program counter.
psw: extern struct {
mask: u64,
@ -1041,26 +1038,10 @@ pub const S390x = extern struct {
var ctx: S390x = undefined;
asm volatile (
\\ stmg %%r0, %%r15, 0(%%r2)
\\ std %%f0, 128(%%r2)
\\ std %%f1, 136(%%r2)
\\ std %%f2, 144(%%r2)
\\ std %%f3, 152(%%r2)
\\ std %%f4, 160(%%r2)
\\ std %%f5, 168(%%r2)
\\ std %%f6, 176(%%r2)
\\ std %%f7, 184(%%r2)
\\ std %%f8, 192(%%r2)
\\ std %%f9, 200(%%r2)
\\ std %%f10, 208(%%r2)
\\ std %%f11, 216(%%r2)
\\ std %%f12, 224(%%r2)
\\ std %%f13, 232(%%r2)
\\ std %%f14, 240(%%r2)
\\ std %%f15, 248(%%r2)
\\ epsw %%r0, %%r1
\\ stm %%r0, %%r1, 256(%%r2)
\\ stm %%r0, %%r1, 128(%%r2)
\\ larl %%r0, .
\\ stg %%r0, 264(%%r2)
\\ stg %%r0, 136(%%r2)
\\ lg %%r0, 0(%%r2)
\\ lg %%r1, 8(%%r2)
:
@ -1072,26 +1053,10 @@ pub const S390x = extern struct {
pub fn dwarfRegisterBytes(ctx: *S390x, register_num: u16) DwarfRegisterError![]u8 {
switch (register_num) {
0...15 => return @ptrCast(&ctx.r[register_num]),
// Why???
16 => return @ptrCast(&ctx.f[0]),
17 => return @ptrCast(&ctx.f[2]),
18 => return @ptrCast(&ctx.f[4]),
19 => return @ptrCast(&ctx.f[6]),
20 => return @ptrCast(&ctx.f[1]),
21 => return @ptrCast(&ctx.f[3]),
22 => return @ptrCast(&ctx.f[5]),
23 => return @ptrCast(&ctx.f[7]),
24 => return @ptrCast(&ctx.f[8]),
25 => return @ptrCast(&ctx.f[10]),
26 => return @ptrCast(&ctx.f[12]),
27 => return @ptrCast(&ctx.f[14]),
28 => return @ptrCast(&ctx.f[9]),
29 => return @ptrCast(&ctx.f[11]),
30 => return @ptrCast(&ctx.f[13]),
31 => return @ptrCast(&ctx.f[15]),
64 => return @ptrCast(&ctx.psw.mask),
65 => return @ptrCast(&ctx.psw.addr),
16...31 => return error.UnsupportedRegister, // f0 - f15
48...63 => return error.UnsupportedRegister, // a0 - a15
68...83 => return error.UnsupportedRegister, // v16 - v31