2f82ec1975
The sad tale of SIGSTKSZ and MINSIGSTKSZ is documented in glibc.git
commit f7c399cff5bd ("PowerPC SIGSTKSZ"), which explains why glibc
does not use the kernel defines for these constants.
Since then in fact there has been a further expansion of the signal
stack frame size on little-endian with linux commit
573ebfa660 ("powerpc: Increase stack redzone for 64-bit userspace to
512 bytes"), which has caused it to exceed even the glibc defines.
See kernel commit 63dee5df43 ("powerpc: Allow 4224 bytes of stack
expansion for the signal frame") for more details of the history of the
expansion.
Increase MINSIGSTKSZ to 8192 which is double the current glibc value and
fits the current stack frame with room to grow. SIGSTKSZ is set to 4x
the minimum as convention.
glibc will have to be updated as well.
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220307182734.289289-1-npiggin@gmail.com
120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_ASM_POWERPC_SIGNAL_H
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#define _UAPI_ASM_POWERPC_SIGNAL_H
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#include <linux/types.h>
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#define _NSIG 64
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#ifdef __powerpc64__
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#define _NSIG_BPW 64
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#else
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#define _NSIG_BPW 32
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#endif
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#define _NSIG_WORDS (_NSIG / _NSIG_BPW)
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typedef unsigned long old_sigset_t; /* at least 32 bits */
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typedef struct {
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unsigned long sig[_NSIG_WORDS];
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} sigset_t;
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#define SIGHUP 1
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#define SIGINT 2
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#define SIGQUIT 3
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#define SIGILL 4
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#define SIGTRAP 5
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#define SIGABRT 6
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#define SIGIOT 6
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#define SIGBUS 7
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#define SIGFPE 8
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#define SIGKILL 9
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#define SIGUSR1 10
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#define SIGSEGV 11
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#define SIGUSR2 12
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#define SIGPIPE 13
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#define SIGALRM 14
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#define SIGTERM 15
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#define SIGSTKFLT 16
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#define SIGCHLD 17
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#define SIGCONT 18
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#define SIGSTOP 19
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#define SIGTSTP 20
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#define SIGTTIN 21
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#define SIGTTOU 22
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#define SIGURG 23
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#define SIGXCPU 24
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#define SIGXFSZ 25
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#define SIGVTALRM 26
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#define SIGPROF 27
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#define SIGWINCH 28
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#define SIGIO 29
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#define SIGPOLL SIGIO
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/*
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#define SIGLOST 29
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*/
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#define SIGPWR 30
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#define SIGSYS 31
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#define SIGUNUSED 31
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/* These should not be considered constants from userland. */
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#define SIGRTMIN 32
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#define SIGRTMAX _NSIG
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#define SA_RESTORER 0x04000000U
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#ifdef __powerpc64__
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#define MINSIGSTKSZ 8192
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#define SIGSTKSZ 32768
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#else
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#define MINSIGSTKSZ 2048
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#define SIGSTKSZ 8192
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#endif
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#include <asm-generic/signal-defs.h>
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#ifndef __KERNEL__
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struct old_sigaction {
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__sighandler_t sa_handler;
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old_sigset_t sa_mask;
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unsigned long sa_flags;
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__sigrestore_t sa_restorer;
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};
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struct sigaction {
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__sighandler_t sa_handler;
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unsigned long sa_flags;
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__sigrestore_t sa_restorer;
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sigset_t sa_mask; /* mask last for extensibility */
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};
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#endif
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typedef struct sigaltstack {
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void __user *ss_sp;
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int ss_flags;
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__kernel_size_t ss_size;
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} stack_t;
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#ifndef __powerpc64__
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/*
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* These are parameters to dbg_sigreturn syscall. They enable or
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* disable certain debugging things that can be done from signal
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* handlers. The dbg_sigreturn syscall *must* be called from a
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* SA_SIGINFO signal so the ucontext can be passed to it. It takes an
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* array of struct sig_dbg_op, which has the debug operations to
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* perform before returning from the signal.
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*/
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struct sig_dbg_op {
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int dbg_type;
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unsigned long dbg_value;
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};
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/* Enable or disable single-stepping. The value sets the state. */
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#define SIG_DBG_SINGLE_STEPPING 1
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/* Enable or disable branch tracing. The value sets the state. */
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#define SIG_DBG_BRANCH_TRACING 2
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#endif /* ! __powerpc64__ */
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#endif /* _UAPI_ASM_POWERPC_SIGNAL_H */
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