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/*
* 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
*/
#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) {
/* b exec_loop */
arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, (long)(&exec_loop));
gen_code_ptr += 4;
} else {
/* 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__ */
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