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Support ELFv2 stack frame.

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The toc pointer save slot changes on ELFv2 from 40(1) to 24(1).

	* elf64-ppc.c (STK_LR, STK_TOC, STK_LINKER): Define.
	(savegpr0_tail, restgpr0_tail, savefpr0_tail, restfpr0_tail)
	build_plt_stub, build_tls_get_addr_stub, ppc_build_one_stub,
	ppc64_elf_relocate_section): Use new defines.
This commit is contained in:
Alan Modra 2013-10-29 16:17:22 +10:30
parent b9e5796b0d
commit a078d95abc
2 changed files with 32 additions and 17 deletions
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7
bfd/ChangeLog
View file

@ -1,3 +1,10 @@
2013-10-30 Alan Modra <amodra@gmail.com>
* elf64-ppc.c (STK_LR, STK_TOC, STK_LINKER): Define.
(savegpr0_tail, restgpr0_tail, savefpr0_tail, restfpr0_tail)
build_plt_stub, build_tls_get_addr_stub, ppc_build_one_stub,
ppc64_elf_relocate_section): Use new defines.
2013-10-30 Alan Modra <amodra@gmail.com>
* elf64-ppc.c (PLT_ENTRY_SIZE, PLT_INITIAL_ENTRY_SIZE): Add htab

42
bfd/elf64-ppc.c
View file

@ -130,6 +130,14 @@ static bfd_vma opd_entry_value
/* The initial size of the plt reserved for the dynamic linker. */
#define PLT_INITIAL_ENTRY_SIZE(htab) (htab->opd_abi ? 24 : 16)
/* Offsets to some stack save slots. */
#define STK_LR 16
#define STK_TOC(htab) (htab->opd_abi ? 40 : 24)
/* This one is dodgy. ABIv2 does not have a linker word, so use the
CR save slot. Used only by optimised __tls_get_addr call stub,
relying on __tls_get_addr_opt not saving CR.. */
#define STK_LINKER(htab) (htab->opd_abi ? 32 : 8)
/* TOC base pointers offset from start of TOC. */
#define TOC_BASE_OFF 0x8000
@ -140,7 +148,7 @@ static bfd_vma opd_entry_value
/* .plt call stub instructions. The normal stub is like this, but
sometimes the .plt entry crosses a 64k boundary and we need to
insert an addi to adjust r11. */
#define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */
#define STD_R2_0R1 0xf8410000 /* std %r2,0+40(%r1) */
#define ADDIS_R11_R2 0x3d620000 /* addis %r11,%r2,xxx@ha */
#define LD_R12_0R11 0xe98b0000 /* ld %r12,xxx+0@l(%r11) */
#define MTCTR_R12 0x7d8903a6 /* mtctr %r12 */
@ -164,7 +172,7 @@ static bfd_vma opd_entry_value
#define LD_R11_0R2 0xe9620000 /* ld %r11,xxx+0(%r2) */
#define LD_R2_0R2 0xe8420000 /* ld %r2,xxx+0(%r2) */
#define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */
#define LD_R2_0R1 0xe8410000 /* ld %r2,0(%r1) */
/* glink call stub instructions. We enter with the index in R0. */
#define GLINK_CALL_STUB_SIZE (16*4)
@ -6505,7 +6513,7 @@ static bfd_byte *
savegpr0_tail (bfd *abfd, bfd_byte *p, int r)
{
p = savegpr0 (abfd, p, r);
bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
bfd_put_32 (abfd, STD_R0_0R1 + STK_LR, p);
p = p + 4;
bfd_put_32 (abfd, BLR, p);
return p + 4;
@ -6521,7 +6529,7 @@ restgpr0 (bfd *abfd, bfd_byte *p, int r)
static bfd_byte *
restgpr0_tail (bfd *abfd, bfd_byte *p, int r)
{
bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
bfd_put_32 (abfd, LD_R0_0R1 + STK_LR, p);
p = p + 4;
p = restgpr0 (abfd, p, r);
bfd_put_32 (abfd, MTLR_R0, p);
@ -6576,7 +6584,7 @@ static bfd_byte *
savefpr0_tail (bfd *abfd, bfd_byte *p, int r)
{
p = savefpr (abfd, p, r);
bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
bfd_put_32 (abfd, STD_R0_0R1 + STK_LR, p);
p = p + 4;
bfd_put_32 (abfd, BLR, p);
return p + 4;
@ -6592,7 +6600,7 @@ restfpr (bfd *abfd, bfd_byte *p, int r)
static bfd_byte *
restfpr0_tail (bfd *abfd, bfd_byte *p, int r)
{
bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
bfd_put_32 (abfd, LD_R0_0R1 + STK_LR, p);
p = p + 4;
p = restfpr (abfd, p, r);
bfd_put_32 (abfd, MTLR_R0, p);
@ -10083,7 +10091,7 @@ build_plt_stub (struct ppc_link_hash_table *htab,
}
if (ALWAYS_EMIT_R2SAVE
|| stub_entry->stub_type == ppc_stub_plt_call_r2save)
bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
bfd_put_32 (obfd, STD_R2_0R1 + STK_TOC (htab), p), p += 4;
bfd_put_32 (obfd, ADDIS_R11_R2 | PPC_HA (offset), p), p += 4;
bfd_put_32 (obfd, LD_R12_0R11 | PPC_LO (offset), p), p += 4;
if (plt_load_toc
@ -10137,7 +10145,7 @@ build_plt_stub (struct ppc_link_hash_table *htab,
}
if (ALWAYS_EMIT_R2SAVE
|| stub_entry->stub_type == ppc_stub_plt_call_r2save)
bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
bfd_put_32 (obfd, STD_R2_0R1 + STK_TOC (htab), p), p += 4;
bfd_put_32 (obfd, LD_R12_0R2 | PPC_LO (offset), p), p += 4;
if (plt_load_toc
&& PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset))
@ -10178,11 +10186,9 @@ build_plt_stub (struct ppc_link_hash_table *htab,
#define ADD_R3_R12_R13 0x7c6c6a14
#define BEQLR 0x4d820020
#define MR_R3_R0 0x7c030378
#define MFLR_R11 0x7d6802a6
#define STD_R11_0R1 0xf9610000
#define BCTRL 0x4e800421
#define LD_R11_0R1 0xe9610000
#define LD_R2_0R1 0xe8410000
#define MTLR_R11 0x7d6803a6
static inline bfd_byte *
@ -10200,15 +10206,15 @@ build_tls_get_addr_stub (struct ppc_link_hash_table *htab,
bfd_put_32 (obfd, BEQLR, p), p += 4;
bfd_put_32 (obfd, MR_R3_R0, p), p += 4;
bfd_put_32 (obfd, MFLR_R11, p), p += 4;
bfd_put_32 (obfd, STD_R11_0R1 + 32, p), p += 4;
bfd_put_32 (obfd, STD_R11_0R1 + STK_LINKER (htab), p), p += 4;
if (r != NULL)
r[0].r_offset += 9 * 4;
p = build_plt_stub (htab, stub_entry, p, offset, r);
bfd_put_32 (obfd, BCTRL, p - 4);
bfd_put_32 (obfd, LD_R11_0R1 + 32, p), p += 4;
bfd_put_32 (obfd, LD_R2_0R1 + 40, p), p += 4;
bfd_put_32 (obfd, LD_R11_0R1 + STK_LINKER (htab), p), p += 4;
bfd_put_32 (obfd, LD_R2_0R1 + STK_TOC (htab), p), p += 4;
bfd_put_32 (obfd, MTLR_R11, p), p += 4;
bfd_put_32 (obfd, BLR, p), p += 4;
@ -10332,7 +10338,7 @@ ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
htab->stub_error = TRUE;
return FALSE;
}
bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
bfd_put_32 (htab->stub_bfd, STD_R2_0R1 + STK_TOC (htab), loc);
loc += 4;
size = 12;
if (PPC_HA (r2off) != 0)
@ -10528,7 +10534,7 @@ ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
return FALSE;
}
bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
bfd_put_32 (htab->stub_bfd, STD_R2_0R1 + STK_TOC (htab), loc);
loc += 4;
size = 20;
if (PPC_HA (off) != 0)
@ -13336,7 +13342,8 @@ ppc64_elf_relocate_section (bfd *output_bfd,
insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
if (insn == NOP
|| insn == CROR_151515 || insn == CROR_313131)
bfd_put_32 (input_bfd, STD_R2_40R1,
bfd_put_32 (input_bfd,
STD_R2_0R1 + STK_TOC (htab),
contents + rel->r_offset);
}
break;
@ -13406,7 +13413,8 @@ ppc64_elf_relocate_section (bfd *output_bfd,
/* Special stub used, leave nop alone. */
}
else
bfd_put_32 (input_bfd, LD_R2_40R1,
bfd_put_32 (input_bfd,
LD_R2_0R1 + STK_TOC (htab),
contents + rel->r_offset + 4);
can_plt_call = TRUE;
}