1/* Assembler macros for m68k.
 2   Copyright (C) 1998-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library.  If not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <sysdeps/generic/sysdep.h>
20
21#ifdef __ASSEMBLER__
22
23/* Define an entry point visible from C.
24
25   There is currently a bug in gdb which prevents us from specifying
26   incomplete stabs information.  Fake some entries here which specify
27   the current source file.  */
28# define ENTRY(name)							      \
29  .globl C_SYMBOL_NAME(name);						      \
30  .type C_SYMBOL_NAME(name),@function;					      \
31  .p2align 2;								      \
32  C_LABEL(name)								      \
33  cfi_startproc;							      \
34  CALL_MCOUNT
35
36# undef END
37# define END(name)							      \
38  cfi_endproc;								      \
39  .size name,.-name
40
41
42/* If compiled for profiling, call `_mcount' at the start of each function.  */
43# ifdef	PROF
44/* The mcount code relies on a normal frame pointer being on the stack
45   to locate our caller, so push one just for its benefit.  */
46#  define CALL_MCOUNT \
47  move.l %fp, -(%sp);							      \
48  cfi_adjust_cfa_offset (4);  cfi_rel_offset (%a6, 0);			      \
49  move.l %sp, %fp;							      \
50  jbsr JUMPTARGET (_mcount);						      \
51  move.l (%sp)+, %fp;							      \
52  cfi_adjust_cfa_offset (-4); cfi_restore (%a6);
53# else
54#  define CALL_MCOUNT		/* Do nothing.  */
55# endif
56
57# define PSEUDO(name, syscall_name, args)				      \
58  .globl __syscall_error;						      \
59  ENTRY (name)								      \
60    DO_CALL (syscall_name, args);					      \
61    jcc JUMPTARGET(__syscall_error)
62
63# undef PSEUDO_END
64# define PSEUDO_END(name)						      \
65  END (name)
66
67# undef JUMPTARGET
68# ifdef PIC
69#  define JUMPTARGET(name)	name##@PLTPC
70# else
71#  define JUMPTARGET(name)	name
72# endif
73
74#endif	/* __ASSEMBLER__ */