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gas: add visibility support for XCOFF

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XCOFF assembly defines the visibility using an additional argument
on several pseudo-ops: .globl, .weak, .extern and .comm.
This implies that .globl and .weak syntax is different than the
usual GNU syntax. But we want to provide compatibility with AIX
assembler, especially because GCC is generating the visibility
using this XCOFF syntax.

PR 22085

bfd/ChangeLog:

        * coffcode.h (coff_write_object_contents): Change XCOFF header
        vstamp field to 2.
        * coffgen.c (coff_print_symbol): Increase the size for n_type.

gas/ChangeLog:

        * config/tc-ppc.c (ppc_xcoff_get_visibility): New function.
        (ppc_globl): New function.
        (ppc_weak): New function.
        (ppc_comm): Add visibility field support.
        (ppc_extern): Likewise.
        * testsuite/gas/all/cofftag.d: Adjust to new n_type size
        providing by objdump.
        * testsuite/gas/ppc/test1xcoff32.d: Likewise.
        * testsuite/gas/ppc/aix.exp: Add new tests.
        * testsuite/gas/ppc/xcoff-visibility-1-32.d: New test.
        * testsuite/gas/ppc/xcoff-visibility-1-64.d: New test.
        * testsuite/gas/ppc/xcoff-visibility-1.s: New test.

include/ChangeLog:

        * coff/internal.h (SYM_V_INTERNAL, SYM_V_HIDDEN,
        SYM_V_PROTECTED, SYM_V_EXPORTED, SYM_V_MASK): New defines.
        * coff/xcoff.h (struct xcoff_link_hash_entry): Add visibility
        field.

ld/ChangeLog:

        * testsuite/ld-pe/pr19803.d: Adjust to new n_type size
        providing by objdump.
This commit is contained in:
Clément Chigot
2021-11-16 14:02:16 +01:00
parent c4f5871457
commit add588a8ef
12 changed files with 423 additions and 39 deletions
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7
include/coff/internal.h
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@ -536,6 +536,13 @@ struct internal_syment
#define DECREF(x) \
((((x) >> N_TSHIFT) & ~ N_BTMASK) | ((x) & N_BTMASK))
/* Visibility flag, in XCOFF n_type. */
#define SYM_V_INTERNAL 0x1000
#define SYM_V_HIDDEN 0x2000
#define SYM_V_PROTECTED 0x3000
#define SYM_V_EXPORTED 0x4000
#define SYM_V_MASK 0xF000
union internal_auxent
{
struct