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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright 2015 Joyent, Inc.
*/
#ifndef _SYS_LX_SIGSTACK_H
#define _SYS_LX_SIGSTACK_H
#if !defined(_ASM)
#include <sys/lx_types.h>
#include <sys/ucontext.h>
#include <sys/lx_signal.h>
#include <lx_signum.h>
#endif /* !defined(_ASM) */
#ifdef __cplusplus
extern "C" {
#endif
/*
* Two flavors of Linux signal stacks:
*
* lx_sigstack - used for "modern" signal handlers, in practice those
* that have the sigaction(2) flag SA_SIGINFO set
*
* lx_oldsigstack - used for legacy signal handlers, those that do not have
* the sigaction(2) flag SA_SIGINFO set or that were setup via
* the signal(2) call.
*
* NOTE: Since these structures will be placed on the stack and stack math will
* be done with their sizes, for the 32-bit code they must be word
* aligned in size (4 bytes) so the stack remains word aligned per the
* i386 ABI, or, for 64-bit code they must be 16 byte aligned as per the
* AMD64 ABI.
*
* The precise layout of these stack frames is also potentially
* depended on by particularly esoteric (or broken) software, and
* should be preserved. The Linux structures (rt_sigframe, et al)
* are defined in "arch/x86/include/asm/sigframe.h".
*/
#if defined(_LP64)
typedef struct lx_sigstack {
void (*retaddr)(); /* address of real lx_rt_sigreturn code */
lx_ucontext_t uc; /* saved user context */
lx_siginfo_t si; /* saved signal information */
lx_fpstate_t fpstate; /* saved FP state */
char pad[2]; /* stack alignment */
} lx_sigstack_t;
#else
struct lx_sigstack {
void (*retaddr)(); /* address of real lx_rt_sigreturn code */
int sig; /* signal number */
lx_siginfo_t *sip; /* points to "si" if valid, NULL if not */
lx_ucontext_t *ucp; /* points to "uc" */
lx_siginfo_t si; /* saved signal information */
lx_ucontext_t uc; /* saved user context */
lx_fpstate_t fpstate; /* saved FP state */
char trampoline[8]; /* code for trampoline to lx_rt_sigreturn() */
};
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_LX_SIGSTACK_H */
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