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Support all of the V.4 relocations

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This commit is contained in:
Michael Meissner 1995-09-26 19:17:10 +00:00
parent e6cb7b411b
commit 65c91be516
3 changed files with 94 additions and 86 deletions
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17
gas/ChangeLog
View file

@ -1,3 +1,20 @@
Tue Sep 26 14:57:59 1995 Michael Meissner <meissner@tiktok.cygnus.com>
* config/tc-ppc.c (ppc_elf_suffix): Support all of the V.4
relocations.
(ppc_elf_cons): Remove restriction that @ suffixes must be done
with .long. Add error if relocation does not fit in the number of
bytes provided.
(md_assemble): For absolute branches, map PC relative relocations
back into an equivalent absolute relocation.
(md_pcrel_from): If TC_FORCE_RELOCATION is true, relocation offset
is 0, not segment start.
(md_apply_fix3): Don't bother writing addend into the instruction,
since it is ignored, given that we use RELA relocations for ELF.
* config/tc-ppc.h (TC_FORCE_RELOCATION): Define to force all
branch prediction relocations to always be emitted.
Mon Sep 25 16:08:43 1995 Michael Meissner <meissner@tiktok.cygnus.com>
* config/tc-ppc.c (ppc_elf_suffix): Lower case reloc before

143
gas/config/tc-ppc.c
View file

@ -567,23 +567,46 @@ ppc_elf_suffix (str_p)
int len;
struct map_bfd *ptr;
#define MAP(str,reloc) { str, sizeof(str)-1, reloc }
static struct map_bfd mapping[] = {
{ "got", 3, BFD_RELOC_PPC_TOC16 },
{ "l", 1, BFD_RELOC_LO16 },
{ "ha", 2, BFD_RELOC_HI16_S },
{ "h", 1, BFD_RELOC_HI16 },
{ "sdarel", 6, BFD_RELOC_GPREL16 },
{ "fixup", 5, BFD_RELOC_CTOR }, /* warnings with -mrelocatable */
{ "brtaken", 7, BFD_RELOC_PPC_B16_BRTAKEN },
{ "brntaken", 8, BFD_RELOC_PPC_B16_BRNTAKEN },
MAP ("got", BFD_RELOC_PPC_TOC16),
MAP ("l", BFD_RELOC_LO16),
MAP ("h", BFD_RELOC_HI16),
MAP ("ha", BFD_RELOC_HI16_S),
MAP ("brtaken", BFD_RELOC_PPC_B16_BRTAKEN),
MAP ("brntaken", BFD_RELOC_PPC_B16_BRNTAKEN),
MAP ("got@l", BFD_RELOC_LO16_GOTOFF),
MAP ("got@h", BFD_RELOC_HI16_GOTOFF),
MAP ("got@ha", BFD_RELOC_HI16_S_GOTOFF),
MAP ("fixup", BFD_RELOC_CTOR), /* warnings with -mrelocatable */
MAP ("pltrel24", BFD_RELOC_24_PLT_PCREL),
MAP ("copy", BFD_RELOC_PPC_COPY),
MAP ("globdat", BFD_RELOC_PPC_GLOB_DAT),
MAP ("local24pc", BFD_RELOC_PPC_LOCAL24PC),
MAP ("plt", BFD_RELOC_32_PLTOFF),
MAP ("pltrel", BFD_RELOC_32_PLT_PCREL),
MAP ("plt@l", BFD_RELOC_LO16_PLTOFF),
MAP ("plt@h", BFD_RELOC_HI16_PLTOFF),
MAP ("plt@ha", BFD_RELOC_HI16_S_PLTOFF),
MAP ("sdarel", BFD_RELOC_GPREL16),
MAP ("sectoff", BFD_RELOC_32_BASEREL),
MAP ("sectoff@l", BFD_RELOC_LO16_BASEREL),
MAP ("sectoff@h", BFD_RELOC_HI16_BASEREL),
MAP ("sectoff@ha", BFD_RELOC_HI16_S_BASEREL),
{ (char *)0, 0, BFD_RELOC_UNUSED }
};
if (*str++ != '@')
return BFD_RELOC_UNUSED;
for (ch = *str, str2 = ident; str2 < ident + sizeof(ident) - 1 && isalpha (ch); ch = *++str)
*str2++ = (islower (ch)) ? ch : tolower (ch);
for (ch = *str, str2 = ident;
str2 < ident + sizeof(ident) - 1 && isalnum (ch) || ch == '@';
ch = *++str)
{
*str2++ = (islower (ch)) ? ch : tolower (ch);
}
*str2 = '\0';
len = str2 - ident;
@ -618,19 +641,23 @@ ppc_elf_cons (nbytes)
do
{
expression (&exp);
if (nbytes == 4
&& exp.X_op == O_symbol
if (exp.X_op == O_symbol
&& *input_line_pointer == '@'
&& (reloc = ppc_elf_suffix (&input_line_pointer)) != BFD_RELOC_UNUSED)
{
register char *p = frag_more ((int) nbytes);
reloc_howto_type *reloc_howto = bfd_reloc_type_lookup (stdoutput, reloc);
int offset = (!reloc_howto) ? 0 : (nbytes - bfd_get_reloc_size (reloc_howto));
int size = bfd_get_reloc_size (reloc_howto);
if (offset < 0)
offset = 0;
if (size > nbytes)
as_bad ("%s relocations do not fit in %d bytes\n", reloc_howto->name, nbytes);
fix_new_exp (frag_now, p - frag_now->fr_literal + offset, (int) nbytes - offset, &exp, 0, reloc);
else
{
register char *p = frag_more ((int) nbytes);
int offset = nbytes - size;
fix_new_exp (frag_now, p - frag_now->fr_literal + offset, size, &exp, 0, reloc);
}
}
else
emit_expr (&exp, (unsigned int) nbytes);
@ -865,6 +892,17 @@ md_assemble (str)
#ifdef OBJ_ELF
else if ((reloc = ppc_elf_suffix (&str)) != BFD_RELOC_UNUSED)
{
/* For the absoulte forms of branchs, convert the PC relative form back into
the absolute. */
if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
switch (reloc)
{
case BFD_RELOC_PPC_B26: reloc = BFD_RELOC_PPC_BA26; break;
case BFD_RELOC_PPC_B16: reloc = BFD_RELOC_PPC_BA16; break;
case BFD_RELOC_PPC_B16_BRTAKEN: reloc = BFD_RELOC_PPC_BA16_BRTAKEN; break;
case BFD_RELOC_PPC_B16_BRNTAKEN: reloc = BFD_RELOC_PPC_BA16_BRNTAKEN; break;
}
/* We need to generate a fixup for this expression. */
if (fc >= MAX_INSN_FIXUPS)
as_fatal ("too many fixups");
@ -2518,7 +2556,8 @@ md_pcrel_from (fixp)
{
#ifdef OBJ_ELF
if (fixp->fx_addsy != (symbolS *) NULL
&& ! S_IS_DEFINED (fixp->fx_addsy))
&& (! S_IS_DEFINED (fixp->fx_addsy)
|| TC_FORCE_RELOCATION (fixp)))
return 0;
#endif
@ -2651,7 +2690,6 @@ md_apply_fix3 (fixp, valuep, seg)
valueT value;
char *where;
unsigned long insn;
unsigned long mask;
/* FIXME FIXME FIXME: The value we are passed in *valuep includes
the symbol values. Since we are using BFD_ASSEMBLER, if we are
@ -2758,7 +2796,7 @@ md_apply_fix3 (fixp, valuep, seg)
&& operand->shift == 0)
fixp->fx_r_type = BFD_RELOC_PPC_BA26;
else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0
&& operand->bits == 26
&& operand->bits == 16
&& operand->shift == 0)
fixp->fx_r_type = BFD_RELOC_PPC_BA16;
else if ((operand->flags & PPC_OPERAND_PARENS) != 0
@ -2786,77 +2824,16 @@ md_apply_fix3 (fixp, valuep, seg)
#ifdef OBJ_ELF
ppc_elf_validate_fix (fixp, seg);
#endif
mask = 0;
switch (fixp->fx_r_type)
{
case BFD_RELOC_32:
case BFD_RELOC_32: /* fixup errant PC relative relocations */
case BFD_RELOC_CTOR:
if (fixp->fx_pcrel)
{
fixp->fx_r_type = BFD_RELOC_32_PCREL;
value += fixp->fx_frag->fr_address + fixp->fx_where;
} /* fall through */
case BFD_RELOC_32_PCREL:
md_number_to_chars (fixp->fx_frag->fr_literal + fixp->fx_where,
value, 4);
break;
case BFD_RELOC_LO16:
case BFD_RELOC_HI16:
case BFD_RELOC_HI16_S:
case BFD_RELOC_PPC_TOC16:
case BFD_RELOC_16:
case BFD_RELOC_GPREL16:
if (fixp->fx_pcrel)
abort ();
mask = 0xffff;
break;
case BFD_RELOC_8:
if (fixp->fx_pcrel)
abort ();
mask = 0xff;
break;
case BFD_RELOC_PPC_B16:
case BFD_RELOC_PPC_B16_BRTAKEN:
case BFD_RELOC_PPC_B16_BRNTAKEN:
case BFD_RELOC_PPC_BA16:
case BFD_RELOC_PPC_BA16_BRTAKEN:
case BFD_RELOC_PPC_BA16_BRNTAKEN:
mask = 0xfffc;
break;
case BFD_RELOC_PPC_B26:
case BFD_RELOC_PPC_BA26:
mask = 0x3fffffc;
break;
default:
abort ();
}
}
/* Fetch the instruction, insert the fully resolved operand
value, and stuff the instruction back again. */
if (mask != 0)
{
where = fixp->fx_frag->fr_literal + fixp->fx_where;
if (target_big_endian)
insn = bfd_getb32 ((unsigned char *) where);
else
insn = bfd_getl32 ((unsigned char *) where);
insn = (insn & ~mask) | (value & mask);
if (target_big_endian)
bfd_putb32 ((bfd_vma) insn, (unsigned char *) where);
else
bfd_putl32 ((bfd_vma) insn, (unsigned char *) where);
}
}
#ifdef OBJ_ELF

20
gas/config/tc-ppc.h
View file

@ -16,7 +16,7 @@
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define TC_PPC
@ -28,12 +28,15 @@
#define TARGET_ARCH (ppc_arch ())
extern enum bfd_architecture ppc_arch PARAMS ((void));
/* Whether or not the target is big endian */
extern int target_big_endian;
/* The target BFD format. */
#ifdef OBJ_COFF
#define TARGET_FORMAT "aixcoff-rs6000"
#endif
#ifdef OBJ_ELF
#define TARGET_FORMAT "elf32-powerpc"
#define TARGET_FORMAT (target_big_endian) ? "elf32-powerpc" : "elf32-powerpcle"
#endif
/* Permit temporary numeric labels. */
@ -63,7 +66,7 @@ extern enum bfd_architecture ppc_arch PARAMS ((void));
/* Set the endianness we are using. Default to big endian. */
#ifndef TARGET_BYTES_BIG_ENDIAN
#ifndef TARGET_BYTES_LITTLE_ENDIAN
#define TARGET_BYTES_BIG_ENDIAN
#define TARGET_BYTES_BIG_ENDIAN 1
#endif
#endif
@ -145,6 +148,9 @@ extern void ppc_frob_section PARAMS ((asection *));
#define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
extern int ppc_frob_symbol PARAMS ((struct symbol *));
/* Niclas Andersson <nican@ida.liu.se> says this is needed. */
#define SUB_SEGMENT_ALIGN(SEG) 2
/* Finish up the file. */
#define tc_frob_file() ppc_frob_file ()
extern void ppc_frob_file PARAMS ((void));
@ -157,6 +163,14 @@ extern void ppc_frob_file PARAMS ((void));
#ifndef GLOBAL_OFFSET_TABLE_NAME
#define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
#endif
/* Branch prediction relocations must force relocation */
#define TC_FORCE_RELOCATION(FIXP) \
((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN \
|| (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN \
|| (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN \
|| (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN)
#endif /* OBJ_ELF */
/* call md_apply_fix3 with segment instead of md_apply_fix */