linux/arch/ia64/include/uapi/asm/siginfo.h

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/*
* Based on <asm-i386/siginfo.h>.
*
* Modified 1998-2002
* David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
*/
#ifndef _UAPI_ASM_IA64_SIGINFO_H
#define _UAPI_ASM_IA64_SIGINFO_H
#define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
#define HAVE_ARCH_SIGINFO_T
#define HAVE_ARCH_COPY_SIGINFO_TO_USER
#include <asm-generic/siginfo.h>
typedef struct siginfo {
int si_signo;
int si_errno;
int si_code;
int __pad0;
union {
int _pad[SI_PAD_SIZE];
/* kill() */
struct {
pid_t _pid; /* sender's pid */
uid_t _uid; /* sender's uid */
} _kill;
/* POSIX.1b timers */
struct {
timer_t _tid; /* timer id */
int _overrun; /* overrun count */
char _pad[sizeof(__ARCH_SI_UID_T) - sizeof(int)];
sigval_t _sigval; /* must overlay ._rt._sigval! */
int _sys_private; /* not to be passed to user */
} _timer;
/* POSIX.1b signals */
struct {
pid_t _pid; /* sender's pid */
uid_t _uid; /* sender's uid */
sigval_t _sigval;
} _rt;
/* SIGCHLD */
struct {
pid_t _pid; /* which child */
uid_t _uid; /* sender's uid */
int _status; /* exit code */
clock_t _utime;
clock_t _stime;
} _sigchld;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
struct {
void __user *_addr; /* faulting insn/memory ref. */
int _imm; /* immediate value for "break" */
unsigned int _flags; /* see below */
unsigned long _isr; /* isr */
short _addr_lsb; /* lsb of faulting address */
union {
/* used when si_code=SEGV_BNDERR */
struct {
void __user *_lower;
void __user *_upper;
} _addr_bnd;
/* used when si_code=SEGV_PKUERR */
mm/pkeys: Fix siginfo ABI breakage caused by new u64 field Stephen Rothwell reported this linux-next build failure: http://lkml.kernel.org/r/20160226164406.065a1ffc@canb.auug.org.au ... caused by the Memory Protection Keys patches from the tip tree triggering a newly introduced build-time sanity check on an ARM build, because they changed the ABI of siginfo in an unexpected way. If u64 has a natural alignment of 8 bytes (which is the case on most mainstream platforms, with the notable exception of x86-32), then the leadup to the _sifields union matters: typedef struct siginfo { int si_signo; int si_errno; int si_code; union { ... } _sifields; } __ARCH_SI_ATTRIBUTES siginfo_t; Note how the first 3 fields give us 12 bytes, so _sifields is not 8 naturally bytes aligned. Before the _pkey field addition the largest element of _sifields (on 32-bit platforms) was 32 bits. With the u64 added, the minimum alignment requirement increased to 8 bytes on those (rare) 32-bit platforms. Thus GCC padded the space after si_code with 4 extra bytes, and shifted all _sifields offsets by 4 bytes - breaking the ABI of all of those remaining fields. On 64-bit platforms this problem was hidden due to _sifields already having numerous fields with natural 8 bytes alignment (pointers). To fix this, we replace the u64 with an '__u32'. The __u32 does not increase the minimum alignment requirement of the union, and it is also large enough to store the 16-bit pkey we have today on x86. Reported-by: Stehen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Stehen Rothwell <sfr@canb.auug.org.au> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Hansen <dave@sr71.net> Cc: Helge Deller <deller@gmx.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-next@vger.kernel.org Fixes: cd0ea35ff551 ("signals, pkeys: Notify userspace about protection key faults") Link: http://lkml.kernel.org/r/20160301125451.02C7426D@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-01 20:54:51 +08:00
__u32 _pkey;
};
} _sigfault;
/* SIGPOLL */
struct {
long _band; /* POLL_IN, POLL_OUT, POLL_MSG (XPG requires a "long") */
int _fd;
} _sigpoll;
} _sifields;
} siginfo_t;
#define si_imm _sifields._sigfault._imm /* as per UNIX SysV ABI spec */
#define si_flags _sifields._sigfault._flags
/*
* si_isr is valid for SIGILL, SIGFPE, SIGSEGV, SIGBUS, and SIGTRAP provided that
* si_code is non-zero and __ISR_VALID is set in si_flags.
*/
#define si_isr _sifields._sigfault._isr
/*
* Flag values for si_flags:
*/
#define __ISR_VALID_BIT 0
#define __ISR_VALID (1 << __ISR_VALID_BIT)
/*
* SIGILL si_codes
*/
#define ILL_BADIADDR (__SI_FAULT|9) /* unimplemented instruction address */
#define __ILL_BREAK (__SI_FAULT|10) /* illegal break */
#define __ILL_BNDMOD (__SI_FAULT|11) /* bundle-update (modification) in progress */
#undef NSIGILL
#define NSIGILL 11
/*
* SIGFPE si_codes
*/
#ifdef __KERNEL__
#define FPE_FIXME (__SI_FAULT|0) /* Broken dup of SI_USER */
#endif /* __KERNEL__ */
#define __FPE_DECOVF (__SI_FAULT|9) /* decimal overflow */
#define __FPE_DECDIV (__SI_FAULT|10) /* decimal division by zero */
#define __FPE_DECERR (__SI_FAULT|11) /* packed decimal error */
#define __FPE_INVASC (__SI_FAULT|12) /* invalid ASCII digit */
#define __FPE_INVDEC (__SI_FAULT|13) /* invalid decimal digit */
#undef NSIGFPE
#define NSIGFPE 13
/*
* SIGSEGV si_codes
*/
#define __SEGV_PSTKOVF (__SI_FAULT|4) /* paragraph stack overflow */
#undef NSIGSEGV
#define NSIGSEGV 4
#undef NSIGTRAP
#define NSIGTRAP 4
#endif /* _UAPI_ASM_IA64_SIGINFO_H */