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)
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struct sigregs {
#if _WORD_SIZE == 4
short sr_gs;
short sr_fs;
#endif /* _WORD_SIZE == 4 */
short sr_es;
short sr_ds;
int sr_di;
int sr_si;
int sr_bp;
int sr_st; /* stack top -- used in kernel */
int sr_bx;
int sr_dx;
int sr_cx;
int sr_retreg;
int sr_retadr; /* return address to caller of save -- used
* in kernel */
int sr_pc;
int sr_cs;
int sr_psw;
int sr_sp;
int sr_ss;
};
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
#if (_MINIX_CHIP == _CHIP_M68000)
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struct sigregs {
long sr_retreg; /* d0 */
long sr_d1;
long sr_d2;
long sr_d3;
long sr_d4;
long sr_d5;
long sr_d6;
long sr_d7;
long sr_a0;
long sr_a1;
long sr_a2;
long sr_a3;
long sr_a4;
long sr_a5;
long sr_a6;
long sr_sp; /* also known as a7 */
long sr_pc;
short sr_psw;
short sr_dummy; /* make size multiple of 4 for system.c */
};
#else
#include "error, _MINIX_CHIP is not supported"
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#endif
#endif /* _MINIX_CHIP == _CHIP_INTEL */
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struct sigcontext {
int sc_flags; /* sigstack state to restore */
long sc_mask; /* signal mask to restore */
struct sigregs sc_regs; /* register set to restore */
};
#if (_MINIX_CHIP == _CHIP_INTEL)
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#if _WORD_SIZE == 4
#define sc_gs sc_regs.sr_gs
#define sc_fs sc_regs.sr_fs
#endif /* _WORD_SIZE == 4 */
#define sc_es sc_regs.sr_es
#define sc_ds sc_regs.sr_ds
#define sc_di sc_regs.sr_di
#define sc_si sc_regs.sr_si
#define sc_fp sc_regs.sr_bp
#define sc_st sc_regs.sr_st /* stack top -- used in kernel */
#define sc_bx sc_regs.sr_bx
#define sc_dx sc_regs.sr_dx
#define sc_cx sc_regs.sr_cx
#define sc_retreg sc_regs.sr_retreg
#define sc_retadr sc_regs.sr_retadr /* return address to caller of
save -- used in kernel */
#define sc_pc sc_regs.sr_pc
#define sc_cs sc_regs.sr_cs
#define sc_psw sc_regs.sr_psw
#define sc_sp sc_regs.sr_sp
#define sc_ss sc_regs.sr_ss
#endif /* _MINIX_CHIP == _CHIP_INTEL */
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#if (_MINIX_CHIP == M68000)
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#define sc_retreg sc_regs.sr_retreg
#define sc_d1 sc_regs.sr_d1
#define sc_d2 sc_regs.sr_d2
#define sc_d3 sc_regs.sr_d3
#define sc_d4 sc_regs.sr_d4
#define sc_d5 sc_regs.sr_d5
#define sc_d6 sc_regs.sr_d6
#define sc_d7 sc_regs.sr_d7
#define sc_a0 sc_regs.sr_a0
#define sc_a1 sc_regs.sr_a1
#define sc_a2 sc_regs.sr_a2
#define sc_a3 sc_regs.sr_a3
#define sc_a4 sc_regs.sr_a4
#define sc_a5 sc_regs.sr_a5
#define sc_fp sc_regs.sr_a6
#define sc_sp sc_regs.sr_sp
#define sc_pc sc_regs.sr_pc
#define sc_psw sc_regs.sr_psw
#endif /* _MINIX_CHIP == M68000 */
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/* Values for sc_flags. Must agree with <minix/jmp_buf.h>. */
#define SC_SIGCONTEXT 2 /* nonzero when signal context is included */
#define SC_NOREGLOCALS 4 /* nonzero when registers are not to be
saved and restored */
_PROTOTYPE( int sigreturn, (struct sigcontext *_scp) );
#endif /* _SIGCONTEXT_H */