darkkirb/old-cross-binutils
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Change PLT code to avoid using r2 - it used by GCC to return large startures

Browse source
This commit is contained in:
Nick Clifton 2001-05-23 16:38:36 +00:00
parent e281c45770
commit 6c426cf36e
2 changed files with 117 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
bfd/ChangeLog
View file

@ -1,3 +1,10 @@
2001-05-23 kaz Kojima <kkojima@rr.iij4u.or.jp>
* elf32-sh.c (elf_sh_plt0_entry_be, elf_sh_plt0_entry,
elf_sh_plt_entry_be, elf_sh_plt_entry, elf_sh_pic_plt_entry_be,
elf_sh_pic_plt_entry): New PLT code, that does not use r2, since
that is used by GCC.
2001-05-23 Nick Clifton <nickc@cambridge.redhat.com> 2001-05-23 Nick Clifton <nickc@cambridge.redhat.com>
* elf-bfd.h (NUM_SHDR_ENTRIES): New macro: compute the number * elf-bfd.h (NUM_SHDR_ENTRIES): New macro: compute the number

110
bfd/elf32-sh.c
View file

@ -2091,6 +2091,115 @@ sh_elf_swap_insns (abfd, sec, relocs, contents, addr)
/* First entry in an absolute procedure linkage table look like this. */ /* First entry in an absolute procedure linkage table look like this. */
#if 1
/* Note - this code has been "optimised" not to use r2. r2 is used by
GCC to return the address of large strutcures, so it should not be
corrupted here. This does mean however, that this PLT does not conform
to the SH PIC ABI. That spec says that r0 contains the type of the PLT
and r2 contains the GOT id. This version stores the GOT id in r0 and
ignores the type. Loaders can easily detect this difference however,
since the type will always be 0 or 8, and the GOT ids will always be
greater than or equal to 12. */
static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] =
{
0xd0, 0x05, /* mov.l 2f,r0 */
0x60, 0x02, /* mov.l @r0,r0 */
0x2f, 0x06, /* mov.l r0,@-r15 */
0xd0, 0x03, /* mov.l 1f,r0 */
0x60, 0x02, /* mov.l @r0,r0 */
0x40, 0x2b, /* jmp @r0 */
0x60, 0xf6, /* mov.l @r15+,r0 */
0x00, 0x09, /* nop */
0x00, 0x09, /* nop */
0x00, 0x09, /* nop */
0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */
0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */
};
static const bfd_byte elf_sh_plt0_entry_le[PLT_ENTRY_SIZE] =
{
0x05, 0xd0, /* mov.l 2f,r0 */
0x02, 0x60, /* mov.l @r0,r0 */
0x06, 0x2f, /* mov.l r0,@-r15 */
0x03, 0xd0, /* mov.l 1f,r0 */
0x02, 0x60, /* mov.l @r0,r0 */
0x2b, 0x40, /* jmp @r0 */
0xf6, 0x60, /* mov.l @r15+,r0 */
0x09, 0x00, /* nop */
0x09, 0x00, /* nop */
0x09, 0x00, /* nop */
0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */
0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */
};
/* Sebsequent entries in an absolute procedure linkage table look like
this. */
static const bfd_byte elf_sh_plt_entry_be[PLT_ENTRY_SIZE] =
{
0xd0, 0x04, /* mov.l 1f,r0 */
0x60, 0x02, /* mov.l @r0,r0 */
0xd1, 0x02, /* mov.l 0f,r1 */
0x40, 0x2b, /* jmp @r0 */
0x60, 0x13, /* mov r1,r0 */
0xd1, 0x03, /* mov.l 2f,r1 */
0x40, 0x2b, /* jmp @r0 */
0x00, 0x09, /* nop */
0, 0, 0, 0, /* 0: replaced with address of .PLT0. */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0, /* 2: replaced with offset into relocation table. */
};
static const bfd_byte elf_sh_plt_entry_le[PLT_ENTRY_SIZE] =
{
0x04, 0xd0, /* mov.l 1f,r0 */
0x02, 0x60, /* mov.l @r0,r0 */
0x02, 0xd1, /* mov.l 0f,r1 */
0x2b, 0x40, /* jmp @r0 */
0x13, 0x60, /* mov r1,r0 */
0x03, 0xd1, /* mov.l 2f,r1 */
0x2b, 0x40, /* jmp @r0 */
0x09, 0x00, /* nop */
0, 0, 0, 0, /* 0: replaced with address of .PLT0. */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0, /* 2: replaced with offset into relocation table. */
};
/* Entries in a PIC procedure linkage table look like this. */
static const bfd_byte elf_sh_pic_plt_entry_be[PLT_ENTRY_SIZE] =
{
0xd0, 0x04, /* mov.l 1f,r0 */
0x00, 0xce, /* mov.l @(r0,r12),r0 */
0x40, 0x2b, /* jmp @r0 */
0x00, 0x09, /* nop */
0x50, 0xc2, /* mov.l @(8,r12),r0 */
0xd1, 0x03, /* mov.l 2f,r1 */
0x40, 0x2b, /* jmp @r0 */
0x50, 0xc1, /* mov.l @(4,r12),r0 */
0x00, 0x09, /* nop */
0x00, 0x09, /* nop */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
};
static const bfd_byte elf_sh_pic_plt_entry_le[PLT_ENTRY_SIZE] =
{
0x04, 0xd0, /* mov.l 1f,r0 */
0xce, 0x00, /* mov.l @(r0,r12),r0 */
0x2b, 0x40, /* jmp @r0 */
0x09, 0x00, /* nop */
0xc2, 0x50, /* mov.l @(8,r12),r0 */
0x03, 0xd1, /* mov.l 2f,r1 */
0x2b, 0x40, /* jmp @r0 */
0xc1, 0x50, /* mov.l @(4,r12),r0 */
0x09, 0x00, /* nop */
0x09, 0x00, /* nop */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
};
#else /* These are the old style PLT entries. */
static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] = static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] =
{ {
0xd0, 0x04, /* mov.l 1f,r0 */ 0xd0, 0x04, /* mov.l 1f,r0 */
@ -2189,6 +2298,7 @@ static const bfd_byte elf_sh_pic_plt_entry_le[PLT_ENTRY_SIZE] =
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */ 0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0 /* 2: replaced with offset into relocation table. */ 0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
}; };
#endif /* old style PLT entries. */
static const bfd_byte *elf_sh_plt0_entry; static const bfd_byte *elf_sh_plt0_entry;
static const bfd_byte *elf_sh_plt_entry; static const bfd_byte *elf_sh_plt_entry;