Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/include/sys/sigcontext.h
Version:
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1 #ifndef _SIGCONTEXT_H 2 #define _SIGCONTEXT_H 3 4 /* The sigcontext structure is used by the sigreturn(2) system call. 5 * sigreturn() is seldom called by user programs, but it is used internally 6 * by the signal catching mechanism. 7 */ 8 9 #ifndef _ANSI_H 10 #include <ansi.h> 11 #endif 12 13 #ifndef _MINIX_SYS_CONFIG_H 14 #include <minix/sys_config.h> 15 #endif 16 17 #if !defined(_MINIX_CHIP) 18 #include "error, configuration is not known" 19 #endif 20 21 /* The following structure should match the stackframe_s structure used 22 * by the kernel's context switching code. Floating point registers should 23 * be added in a different struct. 24 */ 25 #if (_MINIX_CHIP == _CHIP_INTEL) 26 struct sigregs { 27 #if _WORD_SIZE == 4 28 short sr_gs; 29 short sr_fs; 30 #endif /* _WORD_SIZE == 4 */ 31 short sr_es; 32 short sr_ds; 33 int sr_di; 34 int sr_si; 35 int sr_bp; 36 int sr_st; /* stack top -- used in kernel */ 37 int sr_bx; 38 int sr_dx; 39 int sr_cx; 40 int sr_retreg; 41 int sr_retadr; /* return address to caller of save -- used 42 * in kernel */ 43 int sr_pc; 44 int sr_cs; 45 int sr_psw; 46 int sr_sp; 47 int sr_ss; 48 }; 49 50 struct sigframe { /* stack frame created for signalled process */ 51 _PROTOTYPE( void (*sf_retadr), (void) ); 52 int sf_signo; 53 int sf_code; 54 struct sigcontext *sf_scp; 55 int sf_fp; 56 _PROTOTYPE( void (*sf_retadr2), (void) ); 57 struct sigcontext *sf_scpcopy; 58 }; 59 60 #else 61 #if (_MINIX_CHIP == _CHIP_M68000) 62 struct sigregs { 63 long sr_retreg; /* d0 */ 64 long sr_d1; 65 long sr_d2; 66 long sr_d3; 67 long sr_d4; 68 long sr_d5; 69 long sr_d6; 70 long sr_d7; 71 long sr_a0; 72 long sr_a1; 73 long sr_a2; 74 long sr_a3; 75 long sr_a4; 76 long sr_a5; 77 long sr_a6; 78 long sr_sp; /* also known as a7 */ 79 long sr_pc; 80 short sr_psw; 81 short sr_dummy; /* make size multiple of 4 for system.c */ 82 }; 83 #else 84 #include "error, _MINIX_CHIP is not supported" 85 #endif 86 #endif /* _MINIX_CHIP == _CHIP_INTEL */ 87 88 struct sigcontext { 89 int sc_flags; /* sigstack state to restore */ 90 long sc_mask; /* signal mask to restore */ 91 struct sigregs sc_regs; /* register set to restore */ 92 }; 93 94 #if (_MINIX_CHIP == _CHIP_INTEL) 95 #if _WORD_SIZE == 4 96 #define sc_gs sc_regs.sr_gs 97 #define sc_fs sc_regs.sr_fs 98 #endif /* _WORD_SIZE == 4 */ 99 #define sc_es sc_regs.sr_es 100 #define sc_ds sc_regs.sr_ds 101 #define sc_di sc_regs.sr_di 102 #define sc_si sc_regs.sr_si 103 #define sc_fp sc_regs.sr_bp 104 #define sc_st sc_regs.sr_st /* stack top -- used in kernel */ 105 #define sc_bx sc_regs.sr_bx 106 #define sc_dx sc_regs.sr_dx 107 #define sc_cx sc_regs.sr_cx 108 #define sc_retreg sc_regs.sr_retreg 109 #define sc_retadr sc_regs.sr_retadr /* return address to caller of 110 save -- used in kernel */ 111 #define sc_pc sc_regs.sr_pc 112 #define sc_cs sc_regs.sr_cs 113 #define sc_psw sc_regs.sr_psw 114 #define sc_sp sc_regs.sr_sp 115 #define sc_ss sc_regs.sr_ss 116 #endif /* _MINIX_CHIP == _CHIP_INTEL */ 117 118 #if (_MINIX_CHIP == M68000) 119 #define sc_retreg sc_regs.sr_retreg 120 #define sc_d1 sc_regs.sr_d1 121 #define sc_d2 sc_regs.sr_d2 122 #define sc_d3 sc_regs.sr_d3 123 #define sc_d4 sc_regs.sr_d4 124 #define sc_d5 sc_regs.sr_d5 125 #define sc_d6 sc_regs.sr_d6 126 #define sc_d7 sc_regs.sr_d7 127 #define sc_a0 sc_regs.sr_a0 128 #define sc_a1 sc_regs.sr_a1 129 #define sc_a2 sc_regs.sr_a2 130 #define sc_a3 sc_regs.sr_a3 131 #define sc_a4 sc_regs.sr_a4 132 #define sc_a5 sc_regs.sr_a5 133 #define sc_fp sc_regs.sr_a6 134 #define sc_sp sc_regs.sr_sp 135 #define sc_pc sc_regs.sr_pc 136 #define sc_psw sc_regs.sr_psw 137 #endif /* _MINIX_CHIP == M68000 */ 138 139 /* Values for sc_flags. Must agree with <minix/jmp_buf.h>. */ 140 #define SC_SIGCONTEXT 2 /* nonzero when signal context is included */ 141 #define SC_NOREGLOCALS 4 /* nonzero when registers are not to be 142 saved and restored */ 143 144 _PROTOTYPE( int sigreturn, (struct sigcontext *_scp) ); 145 146 #endif /* _SIGCONTEXT_H */
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