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author | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2003-06-09 15:34:19 +0000 |
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committer | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2003-06-09 15:34:19 +0000 |
commit | ff1f20a3ee3fe484bcf5147a124c4e4e878907ba (patch) | |
tree | 280a2b19c9542574b96d357f6c594ccb9025bbf3 /dyngen.h | |
parent | 9c5d1246c7b3da2e625a2257b9680c4d34fbc1fc (diff) | |
download | hqemu-ff1f20a3ee3fe484bcf5147a124c4e4e878907ba.zip hqemu-ff1f20a3ee3fe484bcf5147a124c4e4e878907ba.tar.gz |
arm support - suppressed possibly unsafe sparc nop deletion
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@225 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'dyngen.h')
-rw-r--r-- | dyngen.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/dyngen.h b/dyngen.h new file mode 100644 index 0000000..cafa4f5 --- /dev/null +++ b/dyngen.h @@ -0,0 +1,122 @@ +/* + * 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__ */ + + + |