| [4] | 1 | #ifndef _SIGCONTEXT_H
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| 2 | #define _SIGCONTEXT_H
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| 3 |
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| 4 | /* The sigcontext structure is used by the sigreturn(2) system call.
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| 5 | * sigreturn() is seldom called by user programs, but it is used internally
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| 6 | * by the signal catching mechanism.
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| 7 | */
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| 8 |
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| 9 | #ifndef _ANSI_H
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| 10 | #include <ansi.h>
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| 11 | #endif
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| 12 |
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| 13 | #ifndef _MINIX_SYS_CONFIG_H
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| 14 | #include <minix/sys_config.h>
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| 15 | #endif
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| 16 |
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| 17 | #if !defined(_MINIX_CHIP)
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| 18 | #include "error, configuration is not known"
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| 19 | #endif
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| 20 |
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| 21 | /* The following structure should match the stackframe_s structure used
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| 22 | * by the kernel's context switching code. Floating point registers should
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| 23 | * be added in a different struct.
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| 24 | */
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| 25 | struct sigregs {
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| 26 | short sr_gs;
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| 27 | short sr_fs;
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| 28 | short sr_es;
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| 29 | short sr_ds;
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| 30 | int sr_di;
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| 31 | int sr_si;
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| 32 | int sr_bp;
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| 33 | int sr_st; /* stack top -- used in kernel */
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| 34 | int sr_bx;
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| 35 | int sr_dx;
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| 36 | int sr_cx;
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| 37 | int sr_retreg;
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| 38 | int sr_retadr; /* return address to caller of save -- used
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| 39 | * in kernel */
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| 40 | int sr_pc;
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| 41 | int sr_cs;
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| 42 | int sr_psw;
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| 43 | int sr_sp;
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| 44 | int sr_ss;
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| 45 | };
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| 46 |
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| 47 | struct sigframe { /* stack frame created for signalled process */
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| 48 | _PROTOTYPE( void (*sf_retadr), (void) );
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| 49 | int sf_signo;
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| 50 | int sf_code;
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| 51 | struct sigcontext *sf_scp;
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| 52 | int sf_fp;
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| 53 | _PROTOTYPE( void (*sf_retadr2), (void) );
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| 54 | struct sigcontext *sf_scpcopy;
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| 55 | };
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| 56 |
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| 57 | struct sigcontext {
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| 58 | int sc_flags; /* sigstack state to restore */
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| 59 | long sc_mask; /* signal mask to restore */
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| 60 | struct sigregs sc_regs; /* register set to restore */
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| 61 | };
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| 62 |
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| 63 | #define sc_gs sc_regs.sr_gs
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| 64 | #define sc_fs sc_regs.sr_fs
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| 65 | #define sc_es sc_regs.sr_es
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| 66 | #define sc_ds sc_regs.sr_ds
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| 67 | #define sc_di sc_regs.sr_di
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| 68 | #define sc_si sc_regs.sr_si
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| 69 | #define sc_fp sc_regs.sr_bp
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| 70 | #define sc_st sc_regs.sr_st /* stack top -- used in kernel */
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| 71 | #define sc_bx sc_regs.sr_bx
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| 72 | #define sc_dx sc_regs.sr_dx
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| 73 | #define sc_cx sc_regs.sr_cx
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| 74 | #define sc_retreg sc_regs.sr_retreg
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| 75 | #define sc_retadr sc_regs.sr_retadr /* return address to caller of
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| 76 | save -- used in kernel */
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| 77 | #define sc_pc sc_regs.sr_pc
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| 78 | #define sc_cs sc_regs.sr_cs
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| 79 | #define sc_psw sc_regs.sr_psw
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| 80 | #define sc_sp sc_regs.sr_sp
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| 81 | #define sc_ss sc_regs.sr_ss
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| 82 |
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| 83 | /* Values for sc_flags. Must agree with <minix/jmp_buf.h>. */
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| 84 | #define SC_SIGCONTEXT 2 /* nonzero when signal context is included */
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| 85 | #define SC_NOREGLOCALS 4 /* nonzero when registers are not to be
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| 86 | saved and restored */
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| 87 |
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| 88 | _PROTOTYPE( int sigreturn, (struct sigcontext *_scp) );
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| 89 |
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| 90 | #endif /* _SIGCONTEXT_H */
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