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174 lines
6.4 KiB
174 lines
6.4 KiB
6 years ago
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commit a078d95abc554b6c2572fcab5550591639b1c871
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Author: Alan Modra <amodra@gmail.com>
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Date: Tue Oct 29 16:17:22 2013 +1030
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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).
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* elf64-ppc.c (STK_LR, STK_TOC, STK_LINKER): Define.
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(savegpr0_tail, restgpr0_tail, savefpr0_tail, restfpr0_tail)
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build_plt_stub, build_tls_get_addr_stub, ppc_build_one_stub,
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ppc64_elf_relocate_section): Use new defines.
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Index: gdb-7.6.1/bfd/elf64-ppc.c
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===================================================================
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--- gdb-7.6.1.orig/bfd/elf64-ppc.c
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+++ gdb-7.6.1/bfd/elf64-ppc.c
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@@ -130,6 +130,14 @@ static bfd_vma opd_entry_value
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/* The initial size of the plt reserved for the dynamic linker. */
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#define PLT_INITIAL_ENTRY_SIZE(htab) (htab->opd_abi ? 24 : 16)
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+/* Offsets to some stack save slots. */
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+#define STK_LR 16
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+#define STK_TOC(htab) (htab->opd_abi ? 40 : 24)
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+/* This one is dodgy. ABIv2 does not have a linker word, so use the
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+ CR save slot. Used only by optimised __tls_get_addr call stub,
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+ relying on __tls_get_addr_opt not saving CR.. */
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+#define STK_LINKER(htab) (htab->opd_abi ? 32 : 8)
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+
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/* TOC base pointers offset from start of TOC. */
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#define TOC_BASE_OFF 0x8000
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@@ -140,7 +148,7 @@ static bfd_vma opd_entry_value
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/* .plt call stub instructions. The normal stub is like this, but
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sometimes the .plt entry crosses a 64k boundary and we need to
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insert an addi to adjust r11. */
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-#define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */
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+#define STD_R2_0R1 0xf8410000 /* std %r2,0+40(%r1) */
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#define ADDIS_R11_R2 0x3d620000 /* addis %r11,%r2,xxx@ha */
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#define LD_R12_0R11 0xe98b0000 /* ld %r12,xxx+0@l(%r11) */
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#define MTCTR_R12 0x7d8903a6 /* mtctr %r12 */
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@@ -164,7 +172,7 @@ static bfd_vma opd_entry_value
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#define LD_R11_0R2 0xe9620000 /* ld %r11,xxx+0(%r2) */
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#define LD_R2_0R2 0xe8420000 /* ld %r2,xxx+0(%r2) */
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-#define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */
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+#define LD_R2_0R1 0xe8410000 /* ld %r2,0(%r1) */
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/* glink call stub instructions. We enter with the index in R0. */
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#define GLINK_CALL_STUB_SIZE (16*4)
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@@ -6326,7 +6334,7 @@ static bfd_byte *
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savegpr0_tail (bfd *abfd, bfd_byte *p, int r)
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{
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p = savegpr0 (abfd, p, r);
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- bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
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+ bfd_put_32 (abfd, STD_R0_0R1 + STK_LR, p);
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p = p + 4;
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bfd_put_32 (abfd, BLR, p);
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return p + 4;
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@@ -6342,7 +6350,7 @@ restgpr0 (bfd *abfd, bfd_byte *p, int r)
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static bfd_byte *
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restgpr0_tail (bfd *abfd, bfd_byte *p, int r)
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{
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- bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
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+ bfd_put_32 (abfd, LD_R0_0R1 + STK_LR, p);
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p = p + 4;
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p = restgpr0 (abfd, p, r);
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bfd_put_32 (abfd, MTLR_R0, p);
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@@ -6397,7 +6405,7 @@ static bfd_byte *
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savefpr0_tail (bfd *abfd, bfd_byte *p, int r)
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{
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p = savefpr (abfd, p, r);
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- bfd_put_32 (abfd, STD_R0_0R1 + 16, p);
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+ bfd_put_32 (abfd, STD_R0_0R1 + STK_LR, p);
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p = p + 4;
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bfd_put_32 (abfd, BLR, p);
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return p + 4;
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@@ -6413,7 +6421,7 @@ restfpr (bfd *abfd, bfd_byte *p, int r)
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static bfd_byte *
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restfpr0_tail (bfd *abfd, bfd_byte *p, int r)
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{
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- bfd_put_32 (abfd, LD_R0_0R1 + 16, p);
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+ bfd_put_32 (abfd, LD_R0_0R1 + STK_LR, p);
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p = p + 4;
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p = restfpr (abfd, p, r);
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bfd_put_32 (abfd, MTLR_R0, p);
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@@ -9873,7 +9881,7 @@ build_plt_stub (struct ppc_link_hash_tab
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}
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if (ALWAYS_EMIT_R2SAVE
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|| stub_entry->stub_type == ppc_stub_plt_call_r2save)
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- bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
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+ bfd_put_32 (obfd, STD_R2_0R1 + STK_TOC (htab), p), p += 4;
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bfd_put_32 (obfd, ADDIS_R11_R2 | PPC_HA (offset), p), p += 4;
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bfd_put_32 (obfd, LD_R12_0R11 | PPC_LO (offset), p), p += 4;
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if (plt_load_toc
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@@ -9927,7 +9935,7 @@ build_plt_stub (struct ppc_link_hash_tab
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}
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if (ALWAYS_EMIT_R2SAVE
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|| stub_entry->stub_type == ppc_stub_plt_call_r2save)
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- bfd_put_32 (obfd, STD_R2_40R1, p), p += 4;
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+ bfd_put_32 (obfd, STD_R2_0R1 + STK_TOC (htab), p), p += 4;
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bfd_put_32 (obfd, LD_R12_0R2 | PPC_LO (offset), p), p += 4;
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if (plt_load_toc
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&& PPC_HA (offset + 8 + 8 * plt_static_chain) != PPC_HA (offset))
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@@ -9968,11 +9976,9 @@ build_plt_stub (struct ppc_link_hash_tab
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#define ADD_R3_R12_R13 0x7c6c6a14
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#define BEQLR 0x4d820020
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#define MR_R3_R0 0x7c030378
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-#define MFLR_R11 0x7d6802a6
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#define STD_R11_0R1 0xf9610000
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#define BCTRL 0x4e800421
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#define LD_R11_0R1 0xe9610000
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-#define LD_R2_0R1 0xe8410000
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#define MTLR_R11 0x7d6803a6
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static inline bfd_byte *
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@@ -9990,15 +9996,15 @@ build_tls_get_addr_stub (struct ppc_link
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bfd_put_32 (obfd, BEQLR, p), p += 4;
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bfd_put_32 (obfd, MR_R3_R0, p), p += 4;
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bfd_put_32 (obfd, MFLR_R11, p), p += 4;
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- bfd_put_32 (obfd, STD_R11_0R1 + 32, p), p += 4;
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+ bfd_put_32 (obfd, STD_R11_0R1 + STK_LINKER (htab), p), p += 4;
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if (r != NULL)
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r[0].r_offset += 9 * 4;
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p = build_plt_stub (htab, stub_entry, p, offset, r);
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bfd_put_32 (obfd, BCTRL, p - 4);
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- bfd_put_32 (obfd, LD_R11_0R1 + 32, p), p += 4;
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- bfd_put_32 (obfd, LD_R2_0R1 + 40, p), p += 4;
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+ bfd_put_32 (obfd, LD_R11_0R1 + STK_LINKER (htab), p), p += 4;
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+ bfd_put_32 (obfd, LD_R2_0R1 + STK_TOC (htab), p), p += 4;
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bfd_put_32 (obfd, MTLR_R11, p), p += 4;
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bfd_put_32 (obfd, BLR, p), p += 4;
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@@ -10122,7 +10128,7 @@ ppc_build_one_stub (struct bfd_hash_entr
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htab->stub_error = TRUE;
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return FALSE;
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}
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- bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
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+ bfd_put_32 (htab->stub_bfd, STD_R2_0R1 + STK_TOC (htab), loc);
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loc += 4;
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size = 12;
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if (PPC_HA (r2off) != 0)
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@@ -10318,7 +10324,7 @@ ppc_build_one_stub (struct bfd_hash_entr
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return FALSE;
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}
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- bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc);
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+ bfd_put_32 (htab->stub_bfd, STD_R2_0R1 + STK_TOC (htab), loc);
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loc += 4;
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size = 20;
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if (PPC_HA (off) != 0)
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@@ -13113,7 +13119,8 @@ ppc64_elf_relocate_section (bfd *output_
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insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
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if (insn == NOP
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|| insn == CROR_151515 || insn == CROR_313131)
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- bfd_put_32 (input_bfd, STD_R2_40R1,
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+ bfd_put_32 (input_bfd,
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+ STD_R2_0R1 + STK_TOC (htab),
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contents + rel->r_offset);
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}
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break;
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@@ -13172,7 +13179,8 @@ ppc64_elf_relocate_section (bfd *output_
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/* Special stub used, leave nop alone. */
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}
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else
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- bfd_put_32 (input_bfd, LD_R2_40R1,
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+ bfd_put_32 (input_bfd,
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+ LD_R2_0R1 + STK_TOC (htab),
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contents + rel->r_offset + 4);
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can_plt_call = TRUE;
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}
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