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std.debug: flush SPARC register windows from a new window

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flushw and ta 3 flush all windows *except* the current one. So we need to do
this in a new register window to get all of the ones we care about.
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Alex Rønne Petersen 2025-10-14 09:37:51 +02:00
parent f21a78b5a3
commit 3d3aff0da9
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1 changed files with 10 additions and 8 deletions
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18
lib/std/debug.zig
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@ -807,14 +807,7 @@ const StackIterator = union(enum) {
/// `@frameAddress` and `cpu_context.Native.current` as the caller's stack frame and
/// our own are one and the same.
inline fn init(opt_context_ptr: ?CpuContextPtr) error{CannotUnwindFromContext}!StackIterator {
if (builtin.cpu.arch.isSPARC()) {
// Flush all the register windows on stack.
if (builtin.cpu.has(.sparc, .v9)) {
asm volatile ("flushw" ::: .{ .memory = true });
} else {
asm volatile ("ta 3" ::: .{ .memory = true }); // ST_FLUSH_WINDOWS
}
}
flushSparcWindows();
if (opt_context_ptr) |context_ptr| {
if (SelfInfo == void or !SelfInfo.can_unwind) return error.CannotUnwindFromContext;
// Use `di_first` here so we report the PC in the context before unwinding any further.
@ -842,6 +835,15 @@ const StackIterator = union(enum) {
}
}
noinline fn flushSparcWindows() void {
// Flush all register windows except the current one (hence `noinline`). This ensures that
// we actually see meaningful data on the stack when we walk the frame chain.
if (comptime builtin.target.cpu.has(.sparc, .v9))
asm volatile ("flushw" ::: .{ .memory = true })
else
asm volatile ("ta 3" ::: .{ .memory = true }); // ST_FLUSH_WINDOWS
}
const FpUsability = enum {
/// FP unwinding is impractical on this target. For example, due to its very silly ABI
/// design decisions, it's not possible to do generic FP unwinding on MIPS without a