Change PLT code to avoid using r2 - it used by GCC to return large startures
This commit is contained in:
Nick Clifton
parent
e281c45770
commit
6c426cf36e
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@ -1,3 +1,10 @@
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2001-05-23 kaz Kojima <kkojima@rr.iij4u.or.jp>
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* elf32-sh.c (elf_sh_plt0_entry_be, elf_sh_plt0_entry,
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elf_sh_plt_entry_be, elf_sh_plt_entry, elf_sh_pic_plt_entry_be,
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elf_sh_pic_plt_entry): New PLT code, that does not use r2, since
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that is used by GCC.
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2001-05-23 Nick Clifton <nickc@cambridge.redhat.com>
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* elf-bfd.h (NUM_SHDR_ENTRIES): New macro: compute the number
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110
bfd/elf32-sh.c
110
bfd/elf32-sh.c
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@ -2091,6 +2091,115 @@ sh_elf_swap_insns (abfd, sec, relocs, contents, addr)
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/* First entry in an absolute procedure linkage table look like this. */
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#if 1
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/* Note - this code has been "optimised" not to use r2. r2 is used by
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GCC to return the address of large strutcures, so it should not be
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corrupted here. This does mean however, that this PLT does not conform
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to the SH PIC ABI. That spec says that r0 contains the type of the PLT
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and r2 contains the GOT id. This version stores the GOT id in r0 and
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ignores the type. Loaders can easily detect this difference however,
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since the type will always be 0 or 8, and the GOT ids will always be
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greater than or equal to 12. */
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static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] =
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{
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0xd0, 0x05, /* mov.l 2f,r0 */
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0x60, 0x02, /* mov.l @r0,r0 */
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0x2f, 0x06, /* mov.l r0,@-r15 */
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0xd0, 0x03, /* mov.l 1f,r0 */
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0x60, 0x02, /* mov.l @r0,r0 */
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0x40, 0x2b, /* jmp @r0 */
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0x60, 0xf6, /* mov.l @r15+,r0 */
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0x00, 0x09, /* nop */
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0x00, 0x09, /* nop */
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0x00, 0x09, /* nop */
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0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */
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0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */
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};
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static const bfd_byte elf_sh_plt0_entry_le[PLT_ENTRY_SIZE] =
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{
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0x05, 0xd0, /* mov.l 2f,r0 */
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0x02, 0x60, /* mov.l @r0,r0 */
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0x06, 0x2f, /* mov.l r0,@-r15 */
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0x03, 0xd0, /* mov.l 1f,r0 */
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0x02, 0x60, /* mov.l @r0,r0 */
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0x2b, 0x40, /* jmp @r0 */
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0xf6, 0x60, /* mov.l @r15+,r0 */
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0x09, 0x00, /* nop */
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0x09, 0x00, /* nop */
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0x09, 0x00, /* nop */
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0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */
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0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */
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};
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/* Sebsequent entries in an absolute procedure linkage table look like
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this. */
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static const bfd_byte elf_sh_plt_entry_be[PLT_ENTRY_SIZE] =
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{
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0xd0, 0x04, /* mov.l 1f,r0 */
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0x60, 0x02, /* mov.l @r0,r0 */
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0xd1, 0x02, /* mov.l 0f,r1 */
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0x40, 0x2b, /* jmp @r0 */
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0x60, 0x13, /* mov r1,r0 */
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0xd1, 0x03, /* mov.l 2f,r1 */
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0x40, 0x2b, /* jmp @r0 */
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0x00, 0x09, /* nop */
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0, 0, 0, 0, /* 0: replaced with address of .PLT0. */
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0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
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0, 0, 0, 0, /* 2: replaced with offset into relocation table. */
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};
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static const bfd_byte elf_sh_plt_entry_le[PLT_ENTRY_SIZE] =
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{
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0x04, 0xd0, /* mov.l 1f,r0 */
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0x02, 0x60, /* mov.l @r0,r0 */
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0x02, 0xd1, /* mov.l 0f,r1 */
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0x2b, 0x40, /* jmp @r0 */
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0x13, 0x60, /* mov r1,r0 */
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0x03, 0xd1, /* mov.l 2f,r1 */
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0x2b, 0x40, /* jmp @r0 */
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0x09, 0x00, /* nop */
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0, 0, 0, 0, /* 0: replaced with address of .PLT0. */
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0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
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0, 0, 0, 0, /* 2: replaced with offset into relocation table. */
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};
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/* Entries in a PIC procedure linkage table look like this. */
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static const bfd_byte elf_sh_pic_plt_entry_be[PLT_ENTRY_SIZE] =
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{
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0xd0, 0x04, /* mov.l 1f,r0 */
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0x00, 0xce, /* mov.l @(r0,r12),r0 */
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0x40, 0x2b, /* jmp @r0 */
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0x00, 0x09, /* nop */
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0x50, 0xc2, /* mov.l @(8,r12),r0 */
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0xd1, 0x03, /* mov.l 2f,r1 */
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0x40, 0x2b, /* jmp @r0 */
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0x50, 0xc1, /* mov.l @(4,r12),r0 */
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0x00, 0x09, /* nop */
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0x00, 0x09, /* nop */
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0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
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0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
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};
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static const bfd_byte elf_sh_pic_plt_entry_le[PLT_ENTRY_SIZE] =
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{
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0x04, 0xd0, /* mov.l 1f,r0 */
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0xce, 0x00, /* mov.l @(r0,r12),r0 */
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0x2b, 0x40, /* jmp @r0 */
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0x09, 0x00, /* nop */
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0xc2, 0x50, /* mov.l @(8,r12),r0 */
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0x03, 0xd1, /* mov.l 2f,r1 */
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0x2b, 0x40, /* jmp @r0 */
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0xc1, 0x50, /* mov.l @(4,r12),r0 */
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0x09, 0x00, /* nop */
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0x09, 0x00, /* nop */
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0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
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0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
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};
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#else /* These are the old style PLT entries. */
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static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] =
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{
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0xd0, 0x04, /* mov.l 1f,r0 */
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@ -2189,6 +2298,7 @@ static const bfd_byte elf_sh_pic_plt_entry_le[PLT_ENTRY_SIZE] =
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0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
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0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
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};
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#endif /* old style PLT entries. */
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static const bfd_byte *elf_sh_plt0_entry;
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static const bfd_byte *elf_sh_plt_entry;
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