minix/include/sys/sigcontext.h

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#ifndef _SIGCONTEXT_H
#define _SIGCONTEXT_H
/* The sigcontext structure is used by the sigreturn(2) system call.
* sigreturn() is seldom called by user programs, but it is used internally
* by the signal catching mechanism.
*/
#ifndef _ANSI_H
#include <ansi.h>
#endif
#ifndef _MINIX_SYS_CONFIG_H
#include <minix/sys_config.h>
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#endif
#if !defined(_MINIX_CHIP)
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#include "error, configuration is not known"
#endif
/* The following structure should match the stackframe_s structure used
* by the kernel's context switching code. Floating point registers should
* be added in a different struct.
*/
#if (_MINIX_CHIP == _CHIP_INTEL)
#include <machine/stackframe.h>
#include <machine/fpu.h>
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typedef struct stackframe_s sigregs;
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struct sigframe { /* stack frame created for signalled process */
_PROTOTYPE( void (*sf_retadr), (void) );
int sf_signo;
int sf_code;
struct sigcontext *sf_scp;
int sf_fp;
_PROTOTYPE( void (*sf_retadr2), (void) );
struct sigcontext *sf_scpcopy;
};
#else
#include "error, _MINIX_CHIP is not supported"
#endif /* _MINIX_CHIP == _CHIP_INTEL */
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struct sigcontext {
int sc_flags; /* sigstack state to restore (including
* MF_FPU_INITIALIZED)
*/
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long sc_mask; /* signal mask to restore */
sigregs sc_regs; /* register set to restore */
#if (_MINIX_CHIP == _CHIP_INTEL)
union fpu_state_u sc_fpu_state;
#endif
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};
#if (_MINIX_CHIP == _CHIP_INTEL)
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#if _WORD_SIZE == 4
#define sc_gs sc_regs.gs
#define sc_fs sc_regs.fs
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#endif /* _WORD_SIZE == 4 */
#define sc_es sc_regs.es
#define sc_ds sc_regs.ds
#define sc_di sc_regs.di
#define sc_si sc_regs.si
#define sc_fp sc_regs.bp
#define sc_st sc_regs.st /* stack top -- used in kernel */
#define sc_bx sc_regs.bx
#define sc_dx sc_regs.dx
#define sc_cx sc_regs.cx
#define sc_retreg sc_regs.retreg
#define sc_retadr sc_regs.retadr /* return address to caller of
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save -- used in kernel */
#define sc_pc sc_regs.pc
#define sc_cs sc_regs.cs
#define sc_psw sc_regs.psw
#define sc_sp sc_regs.sp
#define sc_ss sc_regs.ss
#endif /* _MINIX_CHIP == _CHIP_INTEL */
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_PROTOTYPE( int sigreturn, (struct sigcontext *_scp) );
#endif /* _SIGCONTEXT_H */