rockbox/lib/libsetjmp/mips/setjmp.S

#include "config.h"
#include "mips.h"

/* This is a simple version of setjmp and longjmp for MIPS 32 and 64.

   Ian Lance Taylor, Cygnus Support, 13 May 1993.  */

#ifdef __mips16
/* This file contains 32 bit assembly code.  */
        .set nomips16
#endif

#define GPR_LAYOUT                  \
        GPR_OFFSET ($16, 0);        \
        GPR_OFFSET ($17, 1);        \
        GPR_OFFSET ($18, 2);        \
        GPR_OFFSET ($19, 3);        \
        GPR_OFFSET ($20, 4);        \
        GPR_OFFSET ($21, 5);        \
        GPR_OFFSET ($22, 6);        \
        GPR_OFFSET ($23, 7);        \
        GPR_OFFSET ($29, 8);        \
        GPR_OFFSET ($30, 9);        \
        GPR_OFFSET ($31, 10)

#define NUM_GPRS_SAVED 11

#ifdef __mips_hard_float
#define FPR_LAYOUT                   \
        FPR_OFFSET ($f20, 0);        \
        FPR_OFFSET ($f21, 1);        \
        FPR_OFFSET ($f22, 2);        \
        FPR_OFFSET ($f23, 3);        \
        FPR_OFFSET ($f24, 4);        \
        FPR_OFFSET ($f25, 5);        \
        FPR_OFFSET ($f26, 6);        \
        FPR_OFFSET ($f27, 7);        \
        FPR_OFFSET ($f28, 8);        \
        FPR_OFFSET ($f29, 9);        \
        FPR_OFFSET ($f30, 10);       \
        FPR_OFFSET ($f31, 11)
#else
#define FPR_LAYOUT
#endif

#if CPU_MIPS == 64
#define BYTES_PER_WORD 8
#define LOAD_GPR  ld
#define LOAD_FPR  ldc1
#define STORE_GPR sd
#define STORE_FPR sdc1
#else
#define BYTES_PER_WORD 4
#define LOAD_GPR  lw
#define LOAD_FPR  lwc1
#define STORE_GPR sw
#define STORE_FPR swc1
#endif

#define GPOFF(INDEX) (INDEX * BYTES_PER_WORD)
#define FPOFF(INDEX) ((INDEX + NUM_GPRS_SAVED) * BYTES_PER_WORD)

/* int setjmp (jmp_buf);  */
        .globl      setjmp
        .ent        setjmp
setjmp:
        .frame      sp, 0, ra

#define GPR_OFFSET(REG, INDEX) STORE_GPR REG,GPOFF(INDEX)(a0)
#define FPR_OFFSET(REG, INDEX) STORE_FPR REG,FPOFF(INDEX)(a0)
        GPR_LAYOUT
        FPR_LAYOUT
#undef GPR_OFFSET
#undef FPR_OFFSET

        move        v0, $0
        j           ra

        .end        setjmp

/* volatile void longjmp (jmp_buf, int);  */
        .globl      longjmp
        .ent        longjmp
longjmp:
        .frame      sp, 0, ra

#define GPR_OFFSET(REG, INDEX) LOAD_GPR REG,GPOFF(INDEX)(a0)
#define FPR_OFFSET(REG, INDEX) LOAD_FPR REG,FPOFF(INDEX)(a0)
        GPR_LAYOUT
        FPR_LAYOUT
#undef GPR_OFFSET
#undef FPR_OFFSET

        bne        a1, $0, 1f
        li         a1, 1
1:
        move       v0, a1
        j          ra

        .end       longjmp