diff options
Diffstat (limited to 'ports/sysdeps')
| -rw-r--r-- | ports/sysdeps/arm/arm-mcount.S | 35 | ||||
| -rw-r--r-- | ports/sysdeps/arm/gcc-compat.h | 35 |
2 files changed, 65 insertions, 5 deletions
diff --git a/ports/sysdeps/arm/arm-mcount.S b/ports/sysdeps/arm/arm-mcount.S index 8b8653c78e..7e433c6ff7 100644 --- a/ports/sysdeps/arm/arm-mcount.S +++ b/ports/sysdeps/arm/arm-mcount.S @@ -21,6 +21,7 @@ #include <sysdep.h> +#undef mcount #ifdef __thumb2__ .thumb @@ -65,10 +66,20 @@ ENTRY(__gnu_mcount_nc) END(__gnu_mcount_nc) +#include <gcc-compat.h> +#include <shlib-compat.h> + +/* The new __gnu_mcount_nc entry point was introduced in 4.4, so the + static library needs the old one only to support older compilers. + Even in a configuration that only cares about newer compilers, the + shared library might need it only for strict ABI compatibility. */ + +#if GCC_COMPAT (4, 3) || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19) + /* Provide old mcount for backwards compatibility. This requires code be compiled with APCS frame pointers. */ -ENTRY(_mcount) +ENTRY(__mcount_arm_compat) push {r0, r1, r2, r3, fp, lr} cfi_adjust_cfa_offset (24) cfi_rel_offset (r0, 0) @@ -83,7 +94,7 @@ ENTRY(_mcount) ldrne r0, [\B, #-4] movsne r1, lr blne __mcount_internal -#if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__) +# if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__) pop {r0, r1, r2, r3, fp, lr} cfi_adjust_cfa_offset (-24) cfi_restore (r0) @@ -93,12 +104,26 @@ ENTRY(_mcount) cfi_restore (fp) cfi_restore (lr) bx lr -#else +# else pop {r0, r1, r2, r3, fp, pc} +# endif +END(__mcount_arm_compat) + #endif -END(_mcount) + +#if GCC_COMPAT (4, 3) + +strong_alias (__mcount_arm_compat, _mcount) /* The canonical name for the function is `_mcount' in both C and asm, but some old asm code might assume it's `mcount'. */ -#undef mcount weak_alias (_mcount, mcount) + +#elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19) + +compat_symbol (libc, __mcount_arm_compat, _mcount, GLIBC_2_0) + +strong_alias (__mcount_arm_compat, __mcount_arm_compat_1) +compat_symbol (libc, __mcount_arm_compat_1, mcount, GLIBC_2_0) + +#endif diff --git a/ports/sysdeps/arm/gcc-compat.h b/ports/sysdeps/arm/gcc-compat.h new file mode 100644 index 0000000000..680f30e3a7 --- /dev/null +++ b/ports/sysdeps/arm/gcc-compat.h @@ -0,0 +1,35 @@ +/* Macros for checking required GCC compatibility. ARM version. + Copyright (C) 2014 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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _ARM_GCC_COMPAT_H +#define _ARM_GCC_COMPAT_H 1 + +#ifndef GCC_COMPAT_VERSION +# ifdef __ARM_PCS_VFP +/* The hard-float ABI was first supported in 4.5. */ +# define GCC_COMPAT_VERSION GCC_VERSION (4, 5) +# else +/* The EABI configurations (the only ones we handle) were first supported + in 4.1. */ +# define GCC_COMPAT_VERSION GCC_VERSION (4, 1) +# endif +#endif + +#include_next <gcc-compat.h> + +#endif |