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Diffstat (limited to 'sysdeps/arm/__longjmp.S')
| -rw-r--r-- | sysdeps/arm/__longjmp.S | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/sysdeps/arm/__longjmp.S b/sysdeps/arm/__longjmp.S new file mode 100644 index 0000000000..27c57a12df --- /dev/null +++ b/sysdeps/arm/__longjmp.S @@ -0,0 +1,140 @@ +/* longjmp for ARM. + Copyright (C) 1997-2014 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/>. */ + +#include <sysdep.h> +#include <bits/setjmp.h> +#include <rtld-global-offsets.h> +#include <arm-features.h> + +/* __longjmp(jmpbuf, val) */ + +ENTRY (__longjmp) + mov ip, r0 + movs r0, r1 /* get the return value in place */ + it eq + moveq r0, #1 /* can't let setjmp() return zero! */ + +#ifdef CHECK_SP + sfi_breg ip, \ + ldr r4, [\B, #32] /* jmpbuf's sp */ + cfi_undefined (r4) +#ifdef PTR_DEMANGLE + PTR_DEMANGLE (r4, r4, a3, a4) +#endif + CHECK_SP (r4) +#endif + sfi_sp sfi_breg ip, \ + ldmia \B!, JMP_BUF_REGLIST +#ifdef PTR_DEMANGLE + ldr a4, [ip], #4 + PTR_DEMANGLE (a4, a4, a3, a2) + mov sp, a4 + ldr a4, [ip], #4 + PTR_DEMANGLE2 (lr, a4, a3) +#else + ldr sp, [ip], #4 + ldr lr, [ip], #4 +#endif + cfi_restore (v1) + cfi_restore (v2) + cfi_restore (v3) + cfi_restore (v4) + cfi_restore (v5) + cfi_restore (v6) + cfi_restore (sl) + cfi_restore (fp) + cfi_restore (sp) + cfi_restore (lr) + +#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__ +# define NEED_HWCAP 1 +#endif + +#ifdef NEED_HWCAP +# ifdef IS_IN_rtld + ldr a2, 1f + ldr a3, .Lrtld_local_ro +0: add a2, pc, a2 + add a2, a2, a3 + ldr a2, [a2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET] +# else +# ifdef PIC + ldr a2, 1f + ldr a3, .Lrtld_global_ro +0: add a2, pc, a2 + ldr a2, [a2, a3] + ldr a2, [a2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET] +# else + ldr a2, .Lhwcap + ldr a2, [a2, #0] +# endif +# endif +#endif + +#ifdef __SOFTFP__ + tst a2, #HWCAP_ARM_VFP + beq .Lno_vfp +#endif + + /* Restore the VFP registers. */ + /* Following instruction is vldmia ip!, {d8-d15}. */ + sfi_breg r12, \ + ldc p11, cr8, [\B], #64 +.Lno_vfp: + +#ifndef ARM_ASSUME_NO_IWMMXT + tst a2, #HWCAP_ARM_IWMMXT + beq .Lno_iwmmxt + + /* Restore the call-preserved iWMMXt registers. */ + /* Following instructions are wldrd wr10, [ip], #8 (etc.) */ + sfi_breg r12, \ + ldcl p1, cr10, [\B], #8 + sfi_breg r12, \ + ldcl p1, cr11, [\B], #8 + sfi_breg r12, \ + ldcl p1, cr12, [\B], #8 + sfi_breg r12, \ + ldcl p1, cr13, [\B], #8 + sfi_breg r12, \ + ldcl p1, cr14, [\B], #8 + sfi_breg r12, \ + ldcl p1, cr15, [\B], #8 +.Lno_iwmmxt: +#endif + + DO_RET(lr) + +#ifdef NEED_HWCAP +# ifdef IS_IN_rtld +1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS +.Lrtld_local_ro: + .long C_SYMBOL_NAME(_rtld_local_ro)(GOTOFF) +# else +# ifdef PIC +1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS +.Lrtld_global_ro: + .long C_SYMBOL_NAME(_rtld_global_ro)(GOT) +# else +.Lhwcap: + .long C_SYMBOL_NAME(_dl_hwcap) +# endif +# endif +#endif + +END (__longjmp) |