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linux-user/mips/o32: Drop sa_restorer functionality

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The Linux kernel dropped support for sa_restorer on O32 MIPS in the
release 2.5.48 because it was unused. See the comment in
arch/mips/include/uapi/asm/signal.h.

Applications using the kernels UAPI headers will not reserve enough
space for qemu-user to copy the sigaction.sa_restorer field to.
Unrelated data may be overwritten.

Align qemu-user with the kernel by also dropping sa_restorer support.

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250709-mips-sa-restorer-v1-1-fc17120e4afe@t-8ch.de>
This commit is contained in:
Thomas Weißschuh
2025-07-09 22:57:16 +02:00
committed by Richard Henderson
parent cb8607b89f
commit 91748d50c7
2 changed files with 0 additions and 5 deletions
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1
linux-user/mips/target_signal.h
View File

@@ -64,7 +64,6 @@ typedef struct target_sigaltstack {
#define TARGET_SA_NODEFER 0x40000000
#define TARGET_SA_RESTART 0x10000000
#define TARGET_SA_RESETHAND 0x80000000
#define TARGET_SA_RESTORER 0x04000000 /* Only for O32 */
#define TARGET_MINSIGSTKSZ 2048

4
linux-user/syscall_defs.h
View File

@@ -515,10 +515,6 @@ struct target_sigaction {
abi_ulong _sa_handler;
#endif
target_sigset_t sa_mask;
#ifdef TARGET_ARCH_HAS_SA_RESTORER
/* ??? This is always present, but ignored unless O32. */
abi_ulong sa_restorer;
#endif
};
#else
struct target_old_sigaction {