diff options
Diffstat (limited to 'libc/arch-mips/include/machine/signal.h')
| -rw-r--r-- | libc/arch-mips/include/machine/signal.h | 47 |
1 files changed, 37 insertions, 10 deletions
diff --git a/libc/arch-mips/include/machine/signal.h b/libc/arch-mips/include/machine/signal.h index b31715c..b9c1367 100644 --- a/libc/arch-mips/include/machine/signal.h +++ b/libc/arch-mips/include/machine/signal.h @@ -37,15 +37,42 @@ #ifndef _MIPS_SIGNAL_H_ #define _MIPS_SIGNAL_H_ -#define SC_REGMASK (0*REGSZ) -#define SC_STATUS (1*REGSZ) -#define SC_PC (2*REGSZ) -#define SC_REGS (SC_PC+8) -#define SC_FPREGS (SC_REGS+32*8) -#define SC_ACX (SC_FPREGS+32*REGSZ_FP) -#define SC_USED_MATH (SC_ACX+3*REGSZ) -/* OpenBSD compatibility */ -#define SC_MASK SC_REGMASK -#define SC_FPUSED SC_USED_MATH +/* On Mips32, jmpbuf begins with optional 4-byte filler so that + * all saved FP regs are aligned on 8-byte boundary, despite this whole + * struct being mis-declared to users as an array of (4-byte) longs. + * All the following offsets are then from the rounded-up base addr + */ + +/* Fields of same size on all MIPS abis: */ +#define SC_MAGIC (0*4) /* 4 bytes, identify jmpbuf */ +#define SC_MASK (1*4) /* 4 bytes, saved signal mask */ +#define SC_FPSR (2*4) /* 4 bytes, floating point control/status reg */ +/* filler2 (3*4) 4 bytes, pad to 8-byte boundary */ + +/* Registers that are 4-byte on mips32 o32, and 8-byte on mips64 n64 abi */ +#define SC_REGS_SAVED 12 /* ra,gp,sp,s0-s8 */ +#define SC_REGS (4*4) /* SC_REGS_SAVED*REGSZ bytes */ + +/* Floating pt registers are 8-bytes on all abis, + * but the number of saved fp regs varies for o32/n32 versus n64 abis: + */ + +#ifdef __LP64__ +#define SC_FPREGS_SAVED 8 /* all fp regs f24,f25,f26,f27,f28,f29,f30,f31 */ +#else +#define SC_FPREGS_SAVED 6 /* even fp regs f20,f22,f24,f26,f28,f30 */ +#endif + +#define SC_FPREGS (SC_REGS + SC_REGS_SAVED*REGSZ) /* SC_FPREGS_SAVED*REGSZ_FP bytes */ + +#define SC_BYTES (SC_FPREGS + SC_FPREGS_SAVED*REGSZ_FP) +#define SC_LONGS (SC_BYTES/REGSZ) + +#ifdef __LP64__ +/* SC_LONGS is 22, so _JBLEN should be 22 or larger */ +#else +/* SC_LONGS is 28, but must also allocate dynamic-roundup filler. + so _JBLEN should be 29 or larger */ +#endif #endif /* !_MIPS_SIGNAL_H_ */ |