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7650321ce0
__GLRO loaded the word after the requested variable on big-endian
PowerPC, where LOWORD is 4. This can cause the memset implement
go wrong because the masking with the cache line size produces
wrong results, particularly if the loaded value happens to be 1.
The __GLRO macro is not used in any place where loading the lower
32-bit word of a 64-bit value is desired, so the +4 offset is always
wrong.
Fixes commit 18363b4f01
("powerpc: Move cache line size to rtld_global_ro") and bug 26332.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
187 lines
5.3 KiB
C
187 lines
5.3 KiB
C
/* Assembly macros for 32-bit PowerPC.
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdeps/powerpc/sysdep.h>
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#ifdef __ASSEMBLER__
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/* If compiled for profiling, call `_mcount' at the start of each
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function. */
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#ifdef PROF
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/* The mcount code relies on a the return address being on the stack
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to locate our caller and so it can restore it; so store one just
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for its benefit. */
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# define CALL_MCOUNT \
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mflr r0; \
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stw r0,4(r1); \
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cfi_offset (lr, 4); \
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bl JUMPTARGET(_mcount);
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#else /* PROF */
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# define CALL_MCOUNT /* Do nothing. */
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#endif /* PROF */
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#define ENTRY(name) \
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.globl C_SYMBOL_NAME(name); \
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.type C_SYMBOL_NAME(name),@function; \
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.align ALIGNARG(2); \
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C_LABEL(name) \
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cfi_startproc; \
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CALL_MCOUNT
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#define ENTRY_TOCLESS(name) ENTRY(name)
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/* helper macro for accessing the 32-bit powerpc GOT. */
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#define SETUP_GOT_ACCESS(regname,GOT_LABEL) \
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bcl 20,31,GOT_LABEL ; \
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GOT_LABEL: ; \
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mflr (regname)
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#define EALIGN_W_0 /* No words to insert. */
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#define EALIGN_W_1 nop
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#define EALIGN_W_2 nop;nop
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#define EALIGN_W_3 nop;nop;nop
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#define EALIGN_W_4 EALIGN_W_3;nop
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#define EALIGN_W_5 EALIGN_W_4;nop
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#define EALIGN_W_6 EALIGN_W_5;nop
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#define EALIGN_W_7 EALIGN_W_6;nop
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/* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
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past a 2^align boundary. */
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#ifdef PROF
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# define EALIGN(name, alignt, words) \
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.globl C_SYMBOL_NAME(name); \
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.type C_SYMBOL_NAME(name),@function; \
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.align ALIGNARG(2); \
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C_LABEL(name) \
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cfi_startproc; \
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CALL_MCOUNT \
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b 0f; \
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.align ALIGNARG(alignt); \
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EALIGN_W_##words; \
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0:
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#else /* PROF */
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# define EALIGN(name, alignt, words) \
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.globl C_SYMBOL_NAME(name); \
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.type C_SYMBOL_NAME(name),@function; \
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.align ALIGNARG(alignt); \
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EALIGN_W_##words; \
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C_LABEL(name) \
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cfi_startproc;
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#endif
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#undef END
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#define END(name) \
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cfi_endproc; \
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ASM_SIZE_DIRECTIVE(name)
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#define DO_CALL(syscall) \
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li 0,syscall; \
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sc
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#undef JUMPTARGET
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#ifdef PIC
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# define JUMPTARGET(name) name##@plt
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#else
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# define JUMPTARGET(name) name
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#endif
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#if defined SHARED && defined PIC && !defined NO_HIDDEN
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# undef HIDDEN_JUMPTARGET
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# define HIDDEN_JUMPTARGET(name) __GI_##name##@local
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#endif
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#define PSEUDO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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DO_CALL (SYS_ify (syscall_name));
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#define PSEUDO_RET \
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bnslr+; \
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b __syscall_error@local
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#define ret PSEUDO_RET
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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DO_CALL (SYS_ify (syscall_name));
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#define PSEUDO_RET_NOERRNO \
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blr
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#define ret_NOERRNO PSEUDO_RET_NOERRNO
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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DO_CALL (SYS_ify (syscall_name));
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#define PSEUDO_RET_ERRVAL \
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blr
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#define ret_ERRVAL PSEUDO_RET_ERRVAL
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(name) \
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END (name)
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/* Local labels stripped out by the linker. */
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#undef L
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#define L(x) .L##x
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#define XGLUE(a,b) a##b
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#define GLUE(a,b) XGLUE (a,b)
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#define GENERATE_GOT_LABEL(name) GLUE (.got_label, name)
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/* Label in text section. */
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#define C_TEXT(name) name
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/* Read the value of member from rtld_global_ro. */
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#ifdef PIC
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# ifdef SHARED
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# if IS_IN (rtld)
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/* Inside ld.so we use the local alias to avoid runtime GOT
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relocations. */
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# define __GLRO(rOUT, rGOT, member, offset) \
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lwz rOUT,_rtld_local_ro@got(rGOT); \
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lwz rOUT,offset(rOUT)
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# else
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# define __GLRO(rOUT, rGOT, member, offset) \
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lwz rOUT,_rtld_global_ro@got(rGOT); \
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lwz rOUT,offset(rOUT)
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# endif
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# else
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# define __GLRO(rOUT, rGOT, member, offset) \
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lwz rOUT,member@got(rGOT); \
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lwz rOUT,0(rOUT)
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# endif
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#else
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/* Position-dependent code does not require access to the GOT. */
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# define __GLRO(rOUT, rGOT, member, offset) \
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lis rOUT,(member)@ha; \
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lwz rOUT,(member)@l(rOUT)
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#endif /* PIC */
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#endif /* __ASSEMBLER__ */
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