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| author | Kazu Hirata <kazu@codesourcery.com> | 2004-01-19 17:02:45 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@codesourcery.com> | 2004-01-19 17:02:45 +0000 |
| commit | 7e89635aac273e94af135eb3481f01fb03fb76c5 (patch) | |
| tree | e31ea4795a7c4c4f73405b700c95736f51cdfea7 /bfd/coff-h8300.c | |
| parent | 437b434f9a2af5ded386e3ad2ed8438e46899618 (diff) | |
| download | gdb-7e89635aac273e94af135eb3481f01fb03fb76c5.zip gdb-7e89635aac273e94af135eb3481f01fb03fb76c5.tar.gz gdb-7e89635aac273e94af135eb3481f01fb03fb76c5.tar.bz2 | |
* coff-h8300.c: Add and adjust comments about relaxation.
* elf32-h8300.c: Likewise.
Diffstat (limited to 'bfd/coff-h8300.c')
| -rw-r--r-- | bfd/coff-h8300.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/bfd/coff-h8300.c b/bfd/coff-h8300.c index b99a6e9..bd798a6 100644 --- a/bfd/coff-h8300.c +++ b/bfd/coff-h8300.c @@ -776,8 +776,15 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info, src_address += 4; break; - /* A 16-bit absolute relocation that was formerly a 24-/32-bit - absolute relocation. */ + /* This is a 24-/32-bit absolute address in one of the following + instructions: + + "band", "bclr", "biand", "bild", "bior", "bist", "bixor", + "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and + "mov.[bwl]" + + We may relax this into an 16-bit absolute address if it's in + the right range. */ case R_MOVL2: value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); value = bfd_h8300_pad_address (abfd, value); @@ -788,8 +795,9 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info, /* Insert the 16-bit value into the proper location. */ bfd_put_16 (abfd, value, data + dst_address); - /* Fix the opcode. For all the move insns, we simply - need to turn off bit 0x20 in the previous byte. */ + /* Fix the opcode. For all the instructions that belong to + this relaxation, we simply need to turn off bit 0x20 in + the previous byte. */ data[dst_address - 1] &= ~0x20; dst_address += 2; src_address += 4; @@ -834,7 +842,7 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info, bfd_put_8 (abfd, 0x55, data + dst_address - 1); break; case 0x5a: - /* jmp ->bra */ + /* jmp -> bra */ bfd_put_8 (abfd, 0x40, data + dst_address - 1); break; @@ -877,12 +885,15 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info, { case 0x58: /* bCC:16 -> bCC:8 */ - /* Get the condition code from the original insn. */ + /* Get the second byte of the original insn, which contains + the condition code. */ tmp = data[dst_address - 1]; + + /* Compute the fisrt byte of the relaxed instruction. The + original sequence 0x58 0xX0 is relaxed to 0x4X, where X + represents the condition code. */ tmp &= 0xf0; tmp >>= 4; - - /* Now or in the high nibble of the opcode. */ tmp |= 0x40; /* Write it. */ |