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* coff-h8300.c: Add comments about relaxation.

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* elf32-h8300.c: Likewise.
This commit is contained in:
Kazu Hirata 2004-01-16 23:35:49 +00:00
parent e9d78f05df
commit 630a7b0ab7
3 changed files with 97 additions and 10 deletions
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5
bfd/ChangeLog
View File

@ -1,3 +1,8 @@
2004-01-16 Kazu Hirata <kazu@cs.umass.edu>
* coff-h8300.c: Add comments about relaxation.
* elf32-h8300.c: Likewise.
2004-01-14 Maciej W. Rozycki <macro@ds2.pg.gda.pl>
* acinclude.m4: Quote names of macros to be defined by AC_DEFUN

46
bfd/coff-h8300.c
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@ -940,15 +940,26 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info,
break;
/* A 16bit absolute mov.b that is now an 8bit absolute mov.b. */
/* This is a 16-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.b"
We may relax this into an 8-bit absolute address if it's in
the right range. */
case R_MOV16B2:
value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
/* Sanity check. */
/* All instructions with R_H8_DIR16B2 start with 0x6a. */
if (data[dst_address - 2] != 0x6a)
abort ();
temp_code = data[src_address - 1];
/* If this is a mov.b instruction, clear the lower nibble, which
contains the source/destination register number. */
if ((temp_code & 0x10) != 0x10)
temp_code &= 0xf0;
@ -956,15 +967,23 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info,
switch (temp_code)
{
case 0x00:
/* This is mov.b @aa:16,Rd. */
data[dst_address - 2] = (data[src_address - 1] & 0xf) | 0x20;
break;
case 0x80:
/* This is mov.b Rs,@aa:16. */
data[dst_address - 2] = (data[src_address - 1] & 0xf) | 0x30;
break;
case 0x18:
/* This is a bit-maniputation instruction that stores one
bit into memory, one of "bclr", "bist", "bnot", "bset",
and "bst". */
data[dst_address - 2] = 0x7f;
break;
case 0x10:
/* This is a bit-maniputation instruction that loads one bit
from memory, one of "band", "biand", "bild", "bior",
"bixor", "bld", "bor", "btst", and "bxor". */
data[dst_address - 2] = 0x7e;
break;
default:
@ -975,15 +994,26 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info,
src_address += 2;
break;
/* Similarly for a 24bit mov.b */
/* This is a 24-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.b"
We may relax this into an 8-bit absolute address if it's in
the right range. */
case R_MOV24B2:
value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
/* Sanity check. */
/* All instructions with R_MOV24B2 start with 0x6a. */
if (data[dst_address - 2] != 0x6a)
abort ();
temp_code = data[src_address - 1];
/* If this is a mov.b instruction, clear the lower nibble, which
contains the source/destination register number. */
if ((temp_code & 0x30) != 0x30)
temp_code &= 0xf0;
@ -991,15 +1021,23 @@ h8300_reloc16_extra_cases (bfd *abfd, struct bfd_link_info *link_info,
switch (temp_code)
{
case 0x20:
/* This is mov.b @aa:24/32,Rd. */
data[dst_address - 2] = (data[src_address - 1] & 0xf) | 0x20;
break;
case 0xa0:
/* This is mov.b Rs,@aa:24/32. */
data[dst_address - 2] = (data[src_address - 1] & 0xf) | 0x30;
break;
case 0x38:
/* This is a bit-maniputation instruction that stores one
bit into memory, one of "bclr", "bist", "bnot", "bset",
and "bst". */
data[dst_address - 2] = 0x7f;
break;
case 0x30:
/* This is a bit-maniputation instruction that loads one bit
from memory, one of "band", "biand", "bild", "bior",
"bixor", "bld", "bor", "btst", and "bxor". */
data[dst_address - 2] = 0x7e;
break;
default:

56
bfd/elf32-h8300.c
View File

@ -659,6 +659,10 @@ elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
bCC:16 -> bCC:8 2 bytes
bsr:16 -> bsr:8 2 bytes
bset:16 -> bset:8 2 bytes
bset:24/32 -> bset:8 4 bytes
(also applicable to other bit manipulation instructions)
mov.b:16 -> mov.b:8 2 bytes
mov.b:24/32 -> mov.b:8 4 bytes
@ -1000,8 +1004,15 @@ elf32_h8_relax_section (bfd *abfd, asection *sec,
break;
}
/* This is a 16 bit absolute address in a "mov.b" insn, which may
become an 8 bit absolute address if its in the right range. */
/* This is a 16-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.b"
We may relax this into an 8-bit absolute address if it's in
the right range. */
case R_H8_DIR16A8:
{
bfd_vma value;
@ -1021,28 +1032,41 @@ elf32_h8_relax_section (bfd *abfd, asection *sec,
/* Get the opcode. */
code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
/* Sanity check. */
/* All instructions with R_H8_DIR16A8 start with
0x6a. */
if (code != 0x6a)
abort ();
temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
/* If this is a mov.b instruction, clear the lower
nibble, which contains the source/destination
register number. */
if ((temp_code & 0x10) != 0x10)
temp_code &= 0xf0;
switch (temp_code)
{
case 0x00:
/* This is mov.b @aa:16,Rd. */
bfd_put_8 (abfd, (code & 0xf) | 0x20,
contents + irel->r_offset - 2);
break;
case 0x80:
/* This is mov.b Rs,@aa:16. */
bfd_put_8 (abfd, (code & 0xf) | 0x30,
contents + irel->r_offset - 2);
break;
case 0x18:
/* This is a bit-maniputation instruction that
stores one bit into memory, one of "bclr",
"bist", "bnot", "bset", and "bst". */
bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
break;
case 0x10:
/* This is a bit-maniputation instruction that
loads one bit from memory, one of "band",
"biand", "bild", "bior", "bixor", "bld", "bor",
"btst", and "bxor". */
bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
break;
default:
@ -1068,8 +1092,15 @@ elf32_h8_relax_section (bfd *abfd, asection *sec,
break;
}
/* This is a 24 bit absolute address in a "mov.b" insn, which may
become an 8 bit absolute address if its in the right range. */
/* This is a 24-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.b"
We may relax this into an 8-bit absolute address if it's in
the right range. */
case R_H8_DIR24A8:
{
bfd_vma value;
@ -1089,29 +1120,42 @@ elf32_h8_relax_section (bfd *abfd, asection *sec,
/* Get the opcode. */
code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
/* Sanity check. */
/* All instructions with R_H8_DIR24A8 start with
0x6a. */
if (code != 0x6a)
abort ();
temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
/* If this is a mov.b instruction, clear the lower
nibble, which contains the source/destination
register number. */
if ((temp_code & 0x30) != 0x30)
temp_code &= 0xf0;
switch (temp_code)
{
case 0x20:
/* This is mov.b @aa:24/32,Rd. */
bfd_put_8 (abfd, (code & 0xf) | 0x20,
contents + irel->r_offset - 2);
break;
case 0xa0:
/* This is mov.b Rs,@aa:24/32. */
bfd_put_8 (abfd, (code & 0xf) | 0x30,
contents + irel->r_offset - 2);
break;
case 0x38:
/* This is a bit-maniputation instruction that
stores one bit into memory, one of "bclr",
"bist", "bnot", "bset", and "bst". */
bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
break;
case 0x30:
/* This is a bit-maniputation instruction that
loads one bit from memory, one of "band",
"biand", "bild", "bior", "bixor", "bld", "bor",
"btst", and "bxor". */
bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
break;
default: