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[RS6000] ABI_V4 init of toc section 

Since 4c4a180d lto has turned off flag_pic when linking a fixed
position executable.  So flag_pic is zero in rs6000_file_start.
However, when we get to actually emitting code, flag_pic may be on
again.  This results in undefined references to ".LCTOC1".

	PR target/68662
	* config/rs6000/rs6000.c (need_toc_init): New var, set it
	whenever toc_label_name used.
	(rs6000_file_start): Don't set up toc section here,
	(rs6000_output_function_epilogue): do so here instead,
	(rs6000_xcoff_file_start): and here.
	* config/rs6000/rs6000.md (load_toc_aix_si): Set need_toc_init.
	(load_toc_aix_di): Likewise.

From-SVN: r233061
This commit is contained in:
Alan Modra 2016-02-02 10:31:16 +10:30 committed by Alan Modra
parent d0268b37f8
commit 90c8d97130
3 changed files with 36 additions and 9 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2016-02-02 Alan Modra <amodra@gmail.com>
PR target/68662
* config/rs6000/rs6000.c (need_toc_init): New var, set it
whenever toc_label_name used.
(rs6000_file_start): Don't set up toc section here,
(rs6000_output_function_epilogue): do so here instead,
(rs6000_xcoff_file_start): and here.
* config/rs6000/rs6000.md (load_toc_aix_si): Set need_toc_init.
(load_toc_aix_di): Likewise.
2016-02-01 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/69592

30
gcc/config/rs6000/rs6000.c
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@ -209,7 +209,7 @@ tree rs6000_builtin_types[RS6000_BTI_MAX];
tree rs6000_builtin_decls[RS6000_BUILTIN_COUNT];
/* Flag to say the TOC is initialized */
int toc_initialized;
int toc_initialized, need_toc_init;
char toc_label_name[10];
/* Cached value of rs6000_variable_issue. This is cached in
@ -5681,13 +5681,6 @@ rs6000_file_start (void)
if (DEFAULT_ABI == ABI_ELFv2)
fprintf (file, "\t.abiversion 2\n");
if (DEFAULT_ABI == ABI_AIX || DEFAULT_ABI == ABI_ELFv2
|| (TARGET_ELF && flag_pic == 2))
{
switch_to_section (toc_section);
switch_to_section (text_section);
}
}
@ -20363,6 +20356,7 @@ rs6000_output_addr_const_extra (FILE *file, rtx x)
{
putc ('-', file);
assemble_name (file, toc_label_name);
need_toc_init = 1;
}
else if (TARGET_ELF)
fputs ("@toc", file);
@ -23991,7 +23985,10 @@ rs6000_emit_load_toc_table (int fromprolog)
ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (lab));
lab = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf));
if (flag_pic == 2)
got = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (toc_label_name));
{
got = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (toc_label_name));
need_toc_init = 1;
}
else
got = rs6000_got_sym ();
tmp1 = tmp2 = dest;
@ -24036,6 +24033,7 @@ rs6000_emit_load_toc_table (int fromprolog)
rtx tocsym, lab;
tocsym = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (toc_label_name));
need_toc_init = 1;
lab = gen_label_rtx ();
emit_insn (gen_load_toc_v4_PIC_1b (tocsym, lab));
emit_move_insn (dest, gen_rtx_REG (Pmode, LR_REGNO));
@ -24050,6 +24048,7 @@ rs6000_emit_load_toc_table (int fromprolog)
/* This is for AIX code running in non-PIC ELF32. */
rtx realsym = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (toc_label_name));
need_toc_init = 1;
emit_insn (gen_elf_high (dest, realsym));
emit_insn (gen_elf_low (dest, dest, realsym));
}
@ -27586,6 +27585,17 @@ rs6000_output_function_epilogue (FILE *file,
fputs ("\t.align 2\n", file);
}
/* Arrange to define .LCTOC1 label, if not already done. */
if (need_toc_init)
{
need_toc_init = 0;
if (!toc_initialized)
{
switch_to_section (toc_section);
switch_to_section (current_function_section ());
}
}
}
/* -fsplit-stack support. */
@ -31733,6 +31743,7 @@ rs6000_elf_declare_function_name (FILE *file, const char *name, tree decl)
fprintf (file, "\t.long ");
assemble_name (file, toc_label_name);
need_toc_init = 1;
putc ('-', file);
ASM_GENERATE_INTERNAL_LABEL (buf, "LCF", rs6000_pic_labelno);
assemble_name (file, buf);
@ -32125,6 +32136,7 @@ rs6000_xcoff_file_start (void)
fputc ('\n', asm_out_file);
if (write_symbols != NO_DEBUG)
switch_to_section (private_data_section);
switch_to_section (toc_section);
switch_to_section (text_section);
if (profile_flag)
fprintf (asm_out_file, "\t.extern %s\n", RS6000_MCOUNT);

4
gcc/config/rs6000/rs6000.md
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@ -9475,6 +9475,8 @@
"*
{
char buf[30];
extern int need_toc_init;
need_toc_init = 1;
ASM_GENERATE_INTERNAL_LABEL (buf, \"LCTOC\", 1);
operands[1] = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (buf));
operands[2] = gen_rtx_REG (Pmode, 2);
@ -9492,6 +9494,8 @@
"*
{
char buf[30];
extern int need_toc_init;
need_toc_init = 1;
#ifdef TARGET_RELOCATABLE
ASM_GENERATE_INTERNAL_LABEL (buf, \"LCTOC\",
!TARGET_MINIMAL_TOC || TARGET_RELOCATABLE);