Archipelago » qemu

/*

 * dyngen helpers

 * 

 *  Copyright (c) 2003 Fabrice Bellard

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

int __op_param1, __op_param2, __op_param3;

#ifdef __sparc__

  void __op_gen_label1(){}

  void __op_gen_label2(){}

  void __op_gen_label3(){}

#else

  int __op_gen_label1, __op_gen_label2, __op_gen_label3;

#endif

int __op_jmp0, __op_jmp1, __op_jmp2, __op_jmp3;

#ifdef __i386__

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

}

#endif

#ifdef __x86_64__

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

}

#endif

#ifdef __s390__

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

}

#endif

#ifdef __ia64__

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    while (start < stop) {

        asm volatile ("fc %0" :: "r"(start));

        start += 32;

    }

    asm volatile (";;sync.i;;srlz.i;;");

}

#endif

#ifdef __powerpc__

#define MIN_CACHE_LINE_SIZE 8 /* conservative value */

static void inline flush_icache_range(unsigned long start, unsigned long stop)

{

    unsigned long p;

    start &= ~(MIN_CACHE_LINE_SIZE - 1);

    stop = (stop + MIN_CACHE_LINE_SIZE - 1) & ~(MIN_CACHE_LINE_SIZE - 1);

    for (p = start; p < stop; p += MIN_CACHE_LINE_SIZE) {

        asm volatile ("dcbst 0,%0" : : "r"(p) : "memory");

    }

    asm volatile ("sync" : : : "memory");

    for (p = start; p < stop; p += MIN_CACHE_LINE_SIZE) {

        asm volatile ("icbi 0,%0" : : "r"(p) : "memory");

    }

    asm volatile ("sync" : : : "memory");

    asm volatile ("isync" : : : "memory");

}

#endif

#ifdef __alpha__

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    asm ("imb");

}

#endif

#ifdef __sparc__

static void inline flush_icache_range(unsigned long start, unsigned long stop)

{

        unsigned long p;

        p = start & ~(8UL - 1UL);

        stop = (stop + (8UL - 1UL)) & ~(8UL - 1UL);

        for (; p < stop; p += 8)

                __asm__ __volatile__("flush\t%0" : : "r" (p));

}

#endif

#ifdef __arm__

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    register unsigned long _beg __asm ("a1") = start;

    register unsigned long _end __asm ("a2") = stop;

    register unsigned long _flg __asm ("a3") = 0;

    __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));

}

#endif

#ifdef __mc68000

#include <asm/cachectl.h>

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    cacheflush(start,FLUSH_SCOPE_LINE,FLUSH_CACHE_BOTH,stop-start+16);

}

#endif

#ifdef __alpha__

register int gp asm("$29");

static inline void immediate_ldah(void *p, int val) {

    uint32_t *dest = p;

    long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;

    *dest &= ~0xffff;

    *dest |= high;

    *dest |= 31 << 16;

}

static inline void immediate_lda(void *dest, int val) {

    *(uint16_t *) dest = val;

}

void fix_bsr(void *p, int offset) {

    uint32_t *dest = p;

    *dest &= ~((1 << 21) - 1);

    *dest |= (offset >> 2) & ((1 << 21) - 1);

}

#endif /* __alpha__ */

#ifdef __arm__

#define MAX_OP_SIZE    (128 * 4) /* in bytes */

/* max size of the code that can be generated without calling arm_flush_ldr */

#define MAX_FRAG_SIZE  (1024 * 4) 

//#define MAX_FRAG_SIZE  (135 * 4) /* for testing */ 

typedef struct LDREntry {

    uint8_t *ptr;

    uint32_t *data_ptr;

} LDREntry;

static LDREntry arm_ldr_table[1024];

static uint32_t arm_data_table[1024];

extern char exec_loop;

static inline void arm_reloc_pc24(uint32_t *ptr, uint32_t insn, int val)

{

    *ptr = (insn & ~0xffffff) | ((insn + ((val - (int)ptr) >> 2)) & 0xffffff);

}

static uint8_t *arm_flush_ldr(uint8_t *gen_code_ptr,

                              LDREntry *ldr_start, LDREntry *ldr_end, 

                              uint32_t *data_start, uint32_t *data_end, 

                              int gen_jmp)

{

    LDREntry *le;

    uint32_t *ptr;

    int offset, data_size, target;

    uint8_t *data_ptr;

    uint32_t insn;

    data_size = (uint8_t *)data_end - (uint8_t *)data_start;

    if (gen_jmp) {

        /* generate branch to skip the data */

        if (data_size == 0)

            return gen_code_ptr;

        target = (long)gen_code_ptr + data_size + 4;

        arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, target);

        gen_code_ptr += 4;

    }

    /* copy the data */

    data_ptr = gen_code_ptr;

    memcpy(gen_code_ptr, data_start, data_size);

    gen_code_ptr += data_size;

    /* patch the ldr to point to the data */

    for(le = ldr_start; le < ldr_end; le++) {

        ptr = (uint32_t *)le->ptr;

        offset = ((unsigned long)(le->data_ptr) - (unsigned long)data_start) + 

            (unsigned long)data_ptr - 

            (unsigned long)ptr - 8;

        insn = *ptr & ~(0xfff | 0x00800000);

        if (offset < 0) {

            offset = - offset;

        } else {

            insn |= 0x00800000;

        }

        if (offset > 0xfff) {

            fprintf(stderr, "Error ldr offset\n");

            abort();

        }

        insn |= offset;

        *ptr = insn;

    }

    return gen_code_ptr;

}

#endif /* __arm__ */

#ifdef __ia64

/* Patch instruction with "val" where "mask" has 1 bits. */

static inline void ia64_patch (uint64_t insn_addr, uint64_t mask, uint64_t val)

{

    uint64_t m0, m1, v0, v1, b0, b1, *b = (uint64_t *) (insn_addr & -16);

#   define insn_mask ((1UL << 41) - 1)

    unsigned long shift;

    b0 = b[0]; b1 = b[1];

    shift = 5 + 41 * (insn_addr % 16); /* 5 template, 3 x 41-bit insns */

    if (shift >= 64) {

        m1 = mask << (shift - 64);

        v1 = val << (shift - 64);

    } else {

        m0 = mask << shift; m1 = mask >> (64 - shift);

        v0 = val  << shift; v1 = val >> (64 - shift);

        b[0] = (b0 & ~m0) | (v0 & m0);

    }

    b[1] = (b1 & ~m1) | (v1 & m1);

}

static inline void ia64_patch_imm60 (uint64_t insn_addr, uint64_t val)

{

        ia64_patch(insn_addr,

                   0x011ffffe000UL,

                   (  ((val & 0x0800000000000000UL) >> 23) /* bit 59 -> 36 */

                    | ((val & 0x00000000000fffffUL) << 13) /* bit 0 -> 13 */));

        ia64_patch(insn_addr - 1, 0x1fffffffffcUL, val >> 18);

}

static inline void ia64_imm64 (void *insn, uint64_t val)

{

    /* Ignore the slot number of the relocation; GCC and Intel

       toolchains differed for some time on whether IMM64 relocs are

       against slot 1 (Intel) or slot 2 (GCC).  */

    uint64_t insn_addr = (uint64_t) insn & ~3UL;

    ia64_patch(insn_addr + 2,

               0x01fffefe000UL,

               (  ((val & 0x8000000000000000UL) >> 27) /* bit 63 -> 36 */

                | ((val & 0x0000000000200000UL) <<  0) /* bit 21 -> 21 */

                | ((val & 0x00000000001f0000UL) <<  6) /* bit 16 -> 22 */

                | ((val & 0x000000000000ff80UL) << 20) /* bit  7 -> 27 */

                | ((val & 0x000000000000007fUL) << 13) /* bit  0 -> 13 */)

            );

    ia64_patch(insn_addr + 1, 0x1ffffffffffUL, val >> 22);

}

static inline void ia64_imm60b (void *insn, uint64_t val)

{

    /* Ignore the slot number of the relocation; GCC and Intel

       toolchains differed for some time on whether IMM64 relocs are

       against slot 1 (Intel) or slot 2 (GCC).  */

    uint64_t insn_addr = (uint64_t) insn & ~3UL;

    if (val + ((uint64_t) 1 << 59) >= (1UL << 60))

        fprintf(stderr, "%s: value %ld out of IMM60 range\n",

                __FUNCTION__, (int64_t) val);

    ia64_patch_imm60(insn_addr + 2, val);

}

static inline void ia64_imm22 (void *insn, uint64_t val)

{

    if (val + (1 << 21) >= (1 << 22))

        fprintf(stderr, "%s: value %li out of IMM22 range\n",

                __FUNCTION__, (int64_t)val);

    ia64_patch((uint64_t) insn, 0x01fffcfe000UL,

               (  ((val & 0x200000UL) << 15) /* bit 21 -> 36 */

                | ((val & 0x1f0000UL) <<  6) /* bit 16 -> 22 */

                | ((val & 0x00ff80UL) << 20) /* bit  7 -> 27 */

                | ((val & 0x00007fUL) << 13) /* bit  0 -> 13 */));

}

/* Like ia64_imm22(), but also clear bits 20-21.  For addl, this has

   the effect of turning "addl rX=imm22,rY" into "addl

   rX=imm22,r0".  */

static inline void ia64_imm22_r0 (void *insn, uint64_t val)

{

    if (val + (1 << 21) >= (1 << 22))

        fprintf(stderr, "%s: value %li out of IMM22 range\n",

                __FUNCTION__, (int64_t)val);

    ia64_patch((uint64_t) insn, 0x01fffcfe000UL | (0x3UL << 20),

               (  ((val & 0x200000UL) << 15) /* bit 21 -> 36 */

                | ((val & 0x1f0000UL) <<  6) /* bit 16 -> 22 */

                | ((val & 0x00ff80UL) << 20) /* bit  7 -> 27 */

                | ((val & 0x00007fUL) << 13) /* bit  0 -> 13 */));

}

static inline void ia64_imm21b (void *insn, uint64_t val)

{

    if (val + (1 << 20) >= (1 << 21))

        fprintf(stderr, "%s: value %li out of IMM21b range\n",

                __FUNCTION__, (int64_t)val);

    ia64_patch((uint64_t) insn, 0x11ffffe000UL,

               (  ((val & 0x100000UL) << 16) /* bit 20 -> 36 */

                | ((val & 0x0fffffUL) << 13) /* bit  0 -> 13 */));

}

static inline void ia64_nop_b (void *insn)

{

    ia64_patch((uint64_t) insn, (1UL << 41) - 1, 2UL << 37);

}

static inline void ia64_ldxmov(void *insn, uint64_t val)

{

    if (val + (1 << 21) < (1 << 22))

        ia64_patch((uint64_t) insn, 0x1fff80fe000UL, 8UL << 37);

}

static inline int ia64_patch_ltoff(void *insn, uint64_t val,

                                   int relaxable)

{

    if (relaxable && (val + (1 << 21) < (1 << 22))) {

        ia64_imm22_r0(insn, val);

        return 0;

    }

    return 1;

}

struct ia64_fixup {

    struct ia64_fixup *next;

    void *addr;                        /* address that needs to be patched */

    long value;

};

#define IA64_PLT(insn, plt_index)                        \

do {                                                        \

    struct ia64_fixup *fixup = alloca(sizeof(*fixup));        \

    fixup->next = plt_fixes;                                \

    plt_fixes = fixup;                                        \

    fixup->addr = (insn);                                \

    fixup->value = (plt_index);                                \

    plt_offset[(plt_index)] = 1;                        \

} while (0)

#define IA64_LTOFF(insn, val, relaxable)                        \

do {                                                                \

    if (ia64_patch_ltoff(insn, val, relaxable)) {                \

        struct ia64_fixup *fixup = alloca(sizeof(*fixup));        \

        fixup->next = ltoff_fixes;                                \

        ltoff_fixes = fixup;                                        \

        fixup->addr = (insn);                                        \

        fixup->value = (val);                                        \

    }                                                                \

} while (0)

static inline void ia64_apply_fixes (uint8_t **gen_code_pp,

                                     struct ia64_fixup *ltoff_fixes,

                                     uint64_t gp,

                                     struct ia64_fixup *plt_fixes,

                                     int num_plts,

                                     unsigned long *plt_target,

                                     unsigned int *plt_offset)

{

    static const uint8_t plt_bundle[] = {

        0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,        /* nop 0; movl r1=GP */

        0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x60,

        0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,        /* nop 0; brl IP */

        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0

    };

    uint8_t *gen_code_ptr = *gen_code_pp, *plt_start, *got_start, *vp;

    struct ia64_fixup *fixup;

    unsigned int offset = 0;

    struct fdesc {

        long ip;

        long gp;

    } *fdesc;

    int i;

    if (plt_fixes) {

        plt_start = gen_code_ptr;

        for (i = 0; i < num_plts; ++i) {

            if (plt_offset[i]) {

                plt_offset[i] = offset;

                offset += sizeof(plt_bundle);

                fdesc = (struct fdesc *) plt_target[i];

                memcpy(gen_code_ptr, plt_bundle, sizeof(plt_bundle));

                ia64_imm64 (gen_code_ptr + 0x02, fdesc->gp);

                ia64_imm60b(gen_code_ptr + 0x12,

                            (fdesc->ip - (long) (gen_code_ptr + 0x10)) >> 4);

                gen_code_ptr += sizeof(plt_bundle);

            }

        }

        for (fixup = plt_fixes; fixup; fixup = fixup->next)

            ia64_imm21b(fixup->addr,

                        ((long) plt_start + plt_offset[fixup->value]

                         - ((long) fixup->addr & ~0xf)) >> 4);

    }

    got_start = gen_code_ptr;

    /* First, create the GOT: */

    for (fixup = ltoff_fixes; fixup; fixup = fixup->next) {

        /* first check if we already have this value in the GOT: */

        for (vp = got_start; vp < gen_code_ptr; ++vp)

            if (*(uint64_t *) vp == fixup->value)

                break;

        if (vp == gen_code_ptr) {

            /* Nope, we need to put the value in the GOT: */

            *(uint64_t *) vp = fixup->value;

            gen_code_ptr += 8;

        }

        ia64_imm22(fixup->addr, (long) vp - gp);

    }

    /* Keep code ptr aligned. */

    if ((long) gen_code_ptr & 15)

        gen_code_ptr += 8;

    *gen_code_pp = gen_code_ptr;

}

#endif