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std.debug.cpu_context: add sparc*-linux context conversion support

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It's not really a ucontext_t at all. Lovely stuff.
This commit is contained in:
Alex Rønne Petersen 2025-10-14 09:44:42 +02:00
parent b8dd40fde8
commit b2732645b7
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1 changed files with 56 additions and 13 deletions
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69
lib/std/debug/cpu_context.zig
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@ -40,6 +40,26 @@ pub fn fromPosixSignalContext(ctx_ptr: ?*const anyopaque) ?Native {
},
.pc = @truncate(uc.mcontext.pc),
};
} else if (native_arch.isSPARC() and native_os == .linux) {
const SparcStackFrame = extern struct {
l: [8]usize,
i: [8]usize,
_x: [8]usize,
};
// When invoking a signal handler, the kernel builds an `rt_signal_frame` structure on the
// stack and passes a pointer to its `info` field to the signal handler. This implies that
// prior to said `info` field, we will find the `ss` field which, among other things,
// contains the incoming and local registers of the interrupted code.
const frame = @as(*const SparcStackFrame, @ptrFromInt(@as(usize, @intFromPtr(ctx_ptr)) - @sizeOf(SparcStackFrame)));
return .{
.g = uc.mcontext.g,
.o = uc.mcontext.o,
.l = frame.l,
.i = frame.i,
.pc = uc.mcontext.pc,
};
}
// Only unified conversions from here.
@ -1370,9 +1390,32 @@ const signal_ucontext_t = switch (native_os) {
lr: u32,
},
},
// https://github.com/torvalds/linux/blob/cd5a0afbdf8033dc83786315d63f8b325bdba2fd/arch/sparc/include/uapi/asm/uctx.h
.sparc => @compileError("sparc-linux ucontext_t missing"),
.sparc64 => @compileError("sparc64-linux ucontext_t missing"),
// https://github.com/torvalds/linux/blob/cd5a0afbdf8033dc83786315d63f8b325bdba2fd/arch/sparc/kernel/signal_32.c#L48-L49
.sparc => extern struct {
// Not actually a `ucontext_t` at all because, uh, reasons?
_info: std.os.linux.siginfo_t,
mcontext: extern struct {
_psr: u32,
pc: u32,
_npc: u32,
_y: u32,
g: [8]u32,
o: [8]u32,
},
},
// https://github.com/torvalds/linux/blob/cd5a0afbdf8033dc83786315d63f8b325bdba2fd/arch/sparc/kernel/signal_64.c#L247-L248
.sparc64 => extern struct {
// Ditto...
_info: std.os.linux.siginfo_t,
mcontext: extern struct {
g: [8]u64,
o: [8]u64,
_tstate: u64,
pc: u64,
},
},
else => unreachable,
},
// https://github.com/freebsd/freebsd-src/blob/55c28005f544282b984ae0e15dacd0c108d8ab12/sys/sys/_ucontext.h
@ -1497,14 +1540,14 @@ const signal_ucontext_t = switch (native_os) {
},
},
// This needs to be audited by someone with access to the Solaris headers.
.solaris => extern struct {
_flags: u64,
_link: ?*signal_ucontext_t,
_sigmask: std.c.sigset_t,
_stack: std.c.stack_t,
mcontext: switch (native_arch) {
.sparc64 => @compileError("sparc64-solaris mcontext_t missing"),
.x86_64 => extern struct {
.solaris => switch (native_arch) {
.sparc64 => @compileError("sparc64-solaris ucontext_t missing"),
.x86_64 => extern struct {
_flags: u64,
_link: ?*signal_ucontext_t,
_sigmask: std.c.sigset_t,
_stack: std.c.stack_t,
mcontext: extern struct {
r15: u64,
r14: u64,
r13: u64,
@ -1524,8 +1567,8 @@ const signal_ucontext_t = switch (native_os) {
_err: i64,
rip: u64,
},
else => unreachable,
},
else => unreachable,
},
// https://github.com/illumos/illumos-gate/blob/d4ce137bba3bd16823db6374d9e9a643264ce245/usr/src/uts/intel/sys/ucontext.h
.illumos => extern struct {
@ -1637,7 +1680,7 @@ const signal_ucontext_t = switch (native_os) {
},
},
// https://github.com/openbsd/src/blob/42468faed8369d07ae49ae02dd71ec34f59b66cd/sys/arch/sparc64/include/signal.h
.sparc64 => @compileError("sparc64-openbsd mcontext_t missing"),
.sparc64 => @compileError("sparc64-openbsd ucontext_t missing"),
// https://github.com/openbsd/src/blob/42468faed8369d07ae49ae02dd71ec34f59b66cd/sys/arch/i386/include/signal.h
.x86 => extern struct {
mcontext: extern struct {