mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-28 16:48:52 +00:00
1906cf93f8
You might just say: 'Yeah! crosstool-NG's got its own repo!". Unfortunately, that's because the previous repo got damaged beyond repair and I had no backup. That means I'm putting backups in place in the afternoon. That also means we've lost history... :-(
373 lines
15 KiB
Diff
373 lines
15 KiB
Diff
2002-08-03 Jakub Jelinek <jakub@redhat.com>
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* config/tc-i386.c (output_insn): Save frag_now and frag_now_fix ()
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at start of insn, pass it to output_disp and output_imm.
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(output_disp): Added arguments. If _GLOBAL_OFFSET_TABLE_ is seen
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in displacement for R_386_32 reloc, use R_386_GOTPC and compute
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properly addend.
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(output_imm): Added arguments. Compute properly addend for
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R_386_GOTPC.
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(md_apply_fix3): Remove R_386_GOTPC handling.
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* testsuite/gas/i386/gotpc.s: New.
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* testsuite/gas/i386/gotpc.d: New.
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* testsuite/gas/i386/i386.exp: Add gotpc test.
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--- binutils/gas/config/tc-i386.c.jj 2002-07-18 11:35:39.000000000 +0200
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+++ binutils/gas/config/tc-i386.c 2002-08-02 21:13:18.000000000 +0200
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@@ -104,8 +104,10 @@ static void output_insn PARAMS ((void));
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static void output_branch PARAMS ((void));
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static void output_jump PARAMS ((void));
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static void output_interseg_jump PARAMS ((void));
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-static void output_imm PARAMS ((void));
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-static void output_disp PARAMS ((void));
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+static void output_imm PARAMS ((fragS *insn_start_frag,
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+ offsetT insn_start_off));
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+static void output_disp PARAMS ((fragS *insn_start_frag,
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+ offsetT insn_start_off));
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#ifndef I386COFF
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static void s_bss PARAMS ((int));
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#endif
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@@ -3101,14 +3103,21 @@ output_interseg_jump ()
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md_number_to_chars (p + size, (valueT) i.op[0].imms->X_add_number, 2);
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}
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+
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static void
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output_insn ()
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{
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+ fragS *insn_start_frag;
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+ offsetT insn_start_off;
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+
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/* Tie dwarf2 debug info to the address at the start of the insn.
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We can't do this after the insn has been output as the current
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frag may have been closed off. eg. by frag_var. */
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dwarf2_emit_insn (0);
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+ insn_start_frag = frag_now;
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+ insn_start_off = frag_now_fix ();
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+
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/* Output jumps. */
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if (i.tm.opcode_modifier & Jump)
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output_branch ();
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@@ -3179,10 +3188,10 @@ output_insn ()
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}
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if (i.disp_operands)
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- output_disp ();
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+ output_disp (insn_start_frag, insn_start_off);
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if (i.imm_operands)
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- output_imm ();
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+ output_imm (insn_start_frag, insn_start_off);
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}
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#ifdef DEBUG386
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@@ -3194,7 +3203,9 @@ output_insn ()
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}
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static void
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-output_disp ()
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+output_disp (insn_start_frag, insn_start_off)
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+ fragS *insn_start_frag;
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+ offsetT insn_start_off;
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{
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char *p;
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unsigned int n;
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@@ -3224,6 +3235,7 @@ output_disp ()
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}
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else
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{
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+ RELOC_ENUM reloc_type;
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int size = 4;
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int sign = 0;
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int pcrel = (i.flags[n] & Operand_PCrel) != 0;
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@@ -3266,16 +3278,50 @@ output_disp ()
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}
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p = frag_more (size);
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+ reloc_type = reloc (size, pcrel, sign, i.reloc[n]);
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+#ifdef BFD_ASSEMBLER
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+ if (reloc_type == BFD_RELOC_32
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+ && GOT_symbol
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+ && GOT_symbol == i.op[n].disps->X_add_symbol
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+ && (i.op[n].disps->X_op == O_symbol
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+ || (i.op[n].disps->X_op == O_add
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+ && ((symbol_get_value_expression
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+ (i.op[n].disps->X_op_symbol)->X_op)
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+ == O_subtract))))
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+ {
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+ offsetT add;
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+
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+ if (insn_start_frag == frag_now)
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+ add = (p - frag_now->fr_literal) - insn_start_off;
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+ else
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+ {
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+ fragS *fr;
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+
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+ add = insn_start_frag->fr_fix - insn_start_off;
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+ for (fr = insn_start_frag->fr_next;
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+ fr && fr != frag_now; fr = fr->fr_next)
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+ add += fr->fr_fix;
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+ add += p - frag_now->fr_literal;
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+ }
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+
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+ /* We don't support dynamic linking on x86-64 yet. */
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+ if (flag_code == CODE_64BIT)
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+ abort ();
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+ reloc_type = BFD_RELOC_386_GOTPC;
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+ i.op[n].disps->X_add_number += add;
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+ }
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+#endif
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fix_new_exp (frag_now, p - frag_now->fr_literal, size,
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- i.op[n].disps, pcrel,
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- reloc (size, pcrel, sign, i.reloc[n]));
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+ i.op[n].disps, pcrel, reloc_type);
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}
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}
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}
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}
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static void
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-output_imm ()
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+output_imm (insn_start_frag, insn_start_off)
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+ fragS *insn_start_frag;
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+ offsetT insn_start_off;
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{
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char *p;
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unsigned int n;
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@@ -3328,6 +3374,48 @@ output_imm ()
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p = frag_more (size);
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reloc_type = reloc (size, 0, sign, i.reloc[n]);
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#ifdef BFD_ASSEMBLER
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+ /* This is tough to explain. We end up with this one if we
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+ * have operands that look like
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+ * "_GLOBAL_OFFSET_TABLE_+[.-.L284]". The goal here is to
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+ * obtain the absolute address of the GOT, and it is strongly
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+ * preferable from a performance point of view to avoid using
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+ * a runtime relocation for this. The actual sequence of
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+ * instructions often look something like:
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+ *
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+ * call .L66
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+ * .L66:
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+ * popl %ebx
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+ * addl $_GLOBAL_OFFSET_TABLE_+[.-.L66],%ebx
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+ *
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+ * The call and pop essentially return the absolute address
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+ * of the label .L66 and store it in %ebx. The linker itself
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+ * will ultimately change the first operand of the addl so
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+ * that %ebx points to the GOT, but to keep things simple, the
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+ * .o file must have this operand set so that it generates not
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+ * the absolute address of .L66, but the absolute address of
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+ * itself. This allows the linker itself simply treat a GOTPC
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+ * relocation as asking for a pcrel offset to the GOT to be
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+ * added in, and the addend of the relocation is stored in the
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+ * operand field for the instruction itself.
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+ *
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+ * Our job here is to fix the operand so that it would add
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+ * the correct offset so that %ebx would point to itself. The
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+ * thing that is tricky is that .-.L66 will point to the
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+ * beginning of the instruction, so we need to further modify
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+ * the operand so that it will point to itself. There are
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+ * other cases where you have something like:
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+ *
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+ * .long $_GLOBAL_OFFSET_TABLE_+[.-.L66]
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+ *
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+ * and here no correction would be required. Internally in
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+ * the assembler we treat operands of this form as not being
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+ * pcrel since the '.' is explicitly mentioned, and I wonder
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+ * whether it would simplify matters to do it this way. Who
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+ * knows. In earlier versions of the PIC patches, the
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+ * pcrel_adjust field was used to store the correction, but
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+ * since the expression is not pcrel, I felt it would be
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+ * confusing to do it this way. */
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+
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if (reloc_type == BFD_RELOC_32
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&& GOT_symbol
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&& GOT_symbol == i.op[n].imms->X_add_symbol
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@@ -3337,11 +3425,26 @@ output_imm ()
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(i.op[n].imms->X_op_symbol)->X_op)
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== O_subtract))))
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{
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+ offsetT add;
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+
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+ if (insn_start_frag == frag_now)
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+ add = (p - frag_now->fr_literal) - insn_start_off;
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+ else
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+ {
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+ fragS *fr;
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+
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+ add = insn_start_frag->fr_fix - insn_start_off;
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+ for (fr = insn_start_frag->fr_next;
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+ fr && fr != frag_now; fr = fr->fr_next)
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+ add += fr->fr_fix;
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+ add += p - frag_now->fr_literal;
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+ }
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+
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/* We don't support dynamic linking on x86-64 yet. */
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if (flag_code == CODE_64BIT)
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abort ();
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reloc_type = BFD_RELOC_386_GOTPC;
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- i.op[n].imms->X_add_number += 3;
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+ i.op[n].imms->X_add_number += add;
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}
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#endif
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fix_new_exp (frag_now, p - frag_now->fr_literal, size,
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@@ -4542,48 +4645,6 @@ md_apply_fix3 (fixP, valP, seg)
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runtime we merely add the offset to the actual PLT entry. */
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value = -4;
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break;
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- case BFD_RELOC_386_GOTPC:
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-
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-/* This is tough to explain. We end up with this one if we have
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- * operands that look like "_GLOBAL_OFFSET_TABLE_+[.-.L284]". The goal
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- * here is to obtain the absolute address of the GOT, and it is strongly
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- * preferable from a performance point of view to avoid using a runtime
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- * relocation for this. The actual sequence of instructions often look
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- * something like:
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- *
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- * call .L66
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- * .L66:
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- * popl %ebx
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- * addl $_GLOBAL_OFFSET_TABLE_+[.-.L66],%ebx
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- *
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- * The call and pop essentially return the absolute address of
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- * the label .L66 and store it in %ebx. The linker itself will
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- * ultimately change the first operand of the addl so that %ebx points to
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- * the GOT, but to keep things simple, the .o file must have this operand
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- * set so that it generates not the absolute address of .L66, but the
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- * absolute address of itself. This allows the linker itself simply
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- * treat a GOTPC relocation as asking for a pcrel offset to the GOT to be
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- * added in, and the addend of the relocation is stored in the operand
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- * field for the instruction itself.
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- *
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- * Our job here is to fix the operand so that it would add the correct
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- * offset so that %ebx would point to itself. The thing that is tricky is
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- * that .-.L66 will point to the beginning of the instruction, so we need
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- * to further modify the operand so that it will point to itself.
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- * There are other cases where you have something like:
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- *
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- * .long $_GLOBAL_OFFSET_TABLE_+[.-.L66]
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- *
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- * and here no correction would be required. Internally in the assembler
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- * we treat operands of this form as not being pcrel since the '.' is
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- * explicitly mentioned, and I wonder whether it would simplify matters
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- * to do it this way. Who knows. In earlier versions of the PIC patches,
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- * the pcrel_adjust field was used to store the correction, but since the
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- * expression is not pcrel, I felt it would be confusing to do it this
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- * way. */
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-
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- value -= 1;
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- break;
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case BFD_RELOC_386_GOT32:
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case BFD_RELOC_386_TLS_GD:
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case BFD_RELOC_386_TLS_LDM:
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--- binutils/gas/testsuite/gas/i386/gotpc.s.jj 2002-08-02 21:17:57.000000000 +0200
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+++ binutils/gas/testsuite/gas/i386/gotpc.s 2002-08-03 22:55:47.000000000 +0200
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@@ -0,0 +1,40 @@
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+ .text
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+test:
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+ addl $_GLOBAL_OFFSET_TABLE_+[.-test], %eax
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+ addl $_GLOBAL_OFFSET_TABLE_+[.-test], %ebx
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+ addl $_GLOBAL_OFFSET_TABLE_, %eax
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+ addl $_GLOBAL_OFFSET_TABLE_, %ebx
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+ leal _GLOBAL_OFFSET_TABLE+[.-test](%eax), %ebx
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+ leal _GLOBAL_OFFSET_TABLE+[.-test](%ebx), %eax
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+ leal _GLOBAL_OFFSET_TABLE+[.-test](%eax), %eax
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+ leal _GLOBAL_OFFSET_TABLE+[.-test](%ebx), %ebx
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+ subl $_GLOBAL_OFFSET_TABLE_+[.-test], %eax
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+ subl $_GLOBAL_OFFSET_TABLE_+[.-test], %ebx
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+ subl $_GLOBAL_OFFSET_TABLE_, %eax
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+ subl $_GLOBAL_OFFSET_TABLE_, %ebx
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+ orl $_GLOBAL_OFFSET_TABLE_+[.-test], %eax
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+ orl $_GLOBAL_OFFSET_TABLE_+[.-test], %ebx
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+ orl $_GLOBAL_OFFSET_TABLE_, %eax
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+ orl $_GLOBAL_OFFSET_TABLE_, %ebx
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+ movl $_GLOBAL_OFFSET_TABLE_+[.-test], %eax
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+ movl $_GLOBAL_OFFSET_TABLE_+[.-test], %ebx
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+ movl $_GLOBAL_OFFSET_TABLE_, %eax
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+ movl $_GLOBAL_OFFSET_TABLE_, %ebx
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+ movl $_GLOBAL_OFFSET_TABLE_+[.-test], foo
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+ movl $_GLOBAL_OFFSET_TABLE_+[.-test], %gs:foo
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+ gs; movl $_GLOBAL_OFFSET_TABLE_+[.-test], foo
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+ movl $_GLOBAL_OFFSET_TABLE_+[.-test], _GLOBAL_OFFSET_TABLE_
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+ movl _GLOBAL_OFFSET_TABLE_+[.-test], %eax
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+ movl _GLOBAL_OFFSET_TABLE_+[.-test], %ebx
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+ movl %eax, _GLOBAL_OFFSET_TABLE_+[.-test]
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+ movl %ebx, _GLOBAL_OFFSET_TABLE_+[.-test]
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+ movl %eax, %gs:_GLOBAL_OFFSET_TABLE_+[.-test]
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+ movl %ebx, %gs:_GLOBAL_OFFSET_TABLE_+[.-test]
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+ gs; movl %eax, _GLOBAL_OFFSET_TABLE_+[.-test]
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+ gs; movl %ebx, _GLOBAL_OFFSET_TABLE_+[.-test]
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+ leal _GLOBAL_OFFSET_TABLE_@GOTOFF(%ebx), %eax
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+ leal _GLOBAL_OFFSET_TABLE_@GOTOFF(%ebx), %ebx
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+ movl _GLOBAL_OFFSET_TABLE_@GOTOFF(%ebx), %eax
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+ movl _GLOBAL_OFFSET_TABLE_@GOTOFF(%ebx), %ebx
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+ .long _GLOBAL_OFFSET_TABLE_+[.-test]
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+ .long _GLOBAL_OFFSET_TABLE_@GOTOFF
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--- binutils/gas/testsuite/gas/i386/gotpc.d.jj 2002-08-02 21:18:43.000000000 +0200
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+++ binutils/gas/testsuite/gas/i386/gotpc.d 2002-08-03 23:05:43.000000000 +0200
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@@ -0,0 +1,52 @@
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+#objdump: -drw
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+#name: i386 gotpc
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+
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+.*: +file format .*
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+
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+Disassembly of section .text:
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+
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+0+000 <test>:
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+ 0: 05 01 00 00 00 [ ]*add \$0x1,%eax 1: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 5: 81 c3 07 00 00 00 [ ]*add \$0x7,%ebx 7: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ b: 05 01 00 00 00 [ ]*add \$0x1,%eax c: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 10: 81 c3 02 00 00 00 [ ]*add \$0x2,%ebx 12: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 16: 8d 98 16 00 00 00 [ ]*lea 0x16\(%eax\),%ebx 18: (R_386_)?(dir)?32 _GLOBAL_OFFSET_TABLE
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+ 1c: 8d 83 1c 00 00 00 [ ]*lea 0x1c\(%ebx\),%eax 1e: (R_386_)?(dir)?32 _GLOBAL_OFFSET_TABLE
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+ 22: 8d 80 22 00 00 00 [ ]*lea 0x22\(%eax\),%eax 24: (R_386_)?(dir)?32 _GLOBAL_OFFSET_TABLE
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+ 28: 8d 9b 28 00 00 00 [ ]*lea 0x28\(%ebx\),%ebx 2a: (R_386_)?(dir)?32 _GLOBAL_OFFSET_TABLE
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+ 2e: 2d 2f 00 00 00 [ ]*sub \$0x2f,%eax 2f: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 33: 81 eb 35 00 00 00 [ ]*sub \$0x35,%ebx 35: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 39: 2d 01 00 00 00 [ ]*sub \$0x1,%eax 3a: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 3e: 81 eb 02 00 00 00 [ ]*sub \$0x2,%ebx 40: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 44: 0d 45 00 00 00 [ ]*or \$0x45,%eax 45: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 49: 81 cb 4b 00 00 00 [ ]*or \$0x4b,%ebx 4b: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 4f: 0d 01 00 00 00 [ ]*or \$0x1,%eax 50: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 54: 81 cb 02 00 00 00 [ ]*or \$0x2,%ebx 56: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 5a: b8 5b 00 00 00 [ ]*mov \$0x5b,%eax 5b: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 5f: bb 60 00 00 00 [ ]*mov \$0x60,%ebx 60: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 64: b8 01 00 00 00 [ ]*mov \$0x1,%eax 65: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 69: bb 01 00 00 00 [ ]*mov \$0x1,%ebx 6a: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 6e: c7 05 00 00 00 00 74 00 00 00 [ ]*movl \$0x74,0x0 70: (R_386_)?(dir)?32 foo
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+[ ]*74: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 78: 65 c7 05 00 00 00 00 7f 00 00 00 [ ]*movl \$0x7f,%gs:0x0 7b: (R_386_)?(dir)?32 foo
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+[ ]*7f: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 83: 65 c7 05 00 00 00 00 8a 00 00 00 [ ]*movl \$0x8a,%gs:0x0 86: (R_386_)?(dir)?32 foo
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+[ ]*8a: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 8e: c7 05 02 00 00 00 94 00 00 00 [ ]*movl \$0x94,0x2 90: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+[ ]*94: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 98: a1 99 00 00 00 [ ]*mov 0x99,%eax 99: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ 9d: 8b 1d 9f 00 00 00 [ ]*mov 0x9f,%ebx 9f: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ a3: a3 a4 00 00 00 [ ]*mov %eax,0xa4 a4: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ a8: 89 1d aa 00 00 00 [ ]*mov %ebx,0xaa aa: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ ae: 65 a3 b0 00 00 00 [ ]*mov %eax,%gs:0xb0 b0: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ b4: 65 89 1d b7 00 00 00 [ ]*mov %ebx,%gs:0xb7 b7: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ bb: 65 a3 bd 00 00 00 [ ]*mov %eax,%gs:0xbd bd: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ c1: 65 89 1d c4 00 00 00 [ ]*mov %ebx,%gs:0xc4 c4: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ c8: 8d 83 00 00 00 00 [ ]*lea 0x0\(%ebx\),%eax ca: (R_386_)?GOTOFF _GLOBAL_OFFSET_TABLE_
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+ ce: 8d 9b 00 00 00 00 [ ]*lea 0x0\(%ebx\),%ebx d0: (R_386_)?GOTOFF _GLOBAL_OFFSET_TABLE_
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+ d4: 8b 83 00 00 00 00 [ ]*mov 0x0\(%ebx\),%eax d6: (R_386_)?GOTOFF _GLOBAL_OFFSET_TABLE_
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+ da: 8b 9b 00 00 00 00 [ ]*mov 0x0\(%ebx\),%ebx dc: (R_386_)?GOTOFF _GLOBAL_OFFSET_TABLE_
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+ e0: e0 00 [ ]*loopne e2 <test\+0xe2> e0: (R_386_)?GOTPC _GLOBAL_OFFSET_TABLE_
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+ e2: 00 00 [ ]*add %al,\(%eax\)
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+ e4: 00 00 [ ]*add %al,\(%eax\) e4: (R_386_)?GOTOFF _GLOBAL_OFFSET_TABLE_
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+ ...
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--- binutils/gas/testsuite/gas/i386/i386.exp.jj 2002-07-18 11:35:39.000000000 +0200
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+++ binutils/gas/testsuite/gas/i386/i386.exp 2002-08-02 21:57:46.000000000 +0200
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@@ -53,6 +53,7 @@ if [expr ([istarget "i*86-*-*"] || [ist
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run_dump_test "jump"
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run_dump_test "ssemmx2"
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run_dump_test "sse2"
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+ run_dump_test "gotpc"
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|
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# PIC is only supported on ELF targets.
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if { ([istarget "*-*-elf*"] || [istarget "*-*-linux*"] )
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|