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