diff options
Diffstat (limited to 'sysdeps/arc/dl-trampoline.S')
| -rw-r--r-- | sysdeps/arc/dl-trampoline.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/sysdeps/arc/dl-trampoline.S b/sysdeps/arc/dl-trampoline.S new file mode 100644 index 0000000000..eb2a030046 --- /dev/null +++ b/sysdeps/arc/dl-trampoline.S @@ -0,0 +1,72 @@ +/* PLT trampolines. ARC version. + Copyright (C) 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 <sysdep.h> +#include <libc-symbols.h> + +#include <sysdep.h> +#include <sys/syscall.h> + +/* resolver has atypical calling ABI (r11 and r12) + PLTn which lands us here, sets up + r11 = Module info (tpnt pointer as expected by resolver) + r12 = PC of the PLTn itself - needed by resolver to find + corresponding .rela.plt entry. */ + +ENTRY (_dl_runtime_resolve) + + /* save args to func being resolved before entering resolver. */ + push_s r0 + push_s r1 + push_s r2 + push_s r3 + st.a r4, [sp, -4] + st.a r5, [sp, -4] + st.a r6, [sp, -4] + st.a r7, [sp, -4] + st.a r8, [sp, -4] + st.a r9, [sp, -4] + cfi_adjust_cfa_offset (40) + push_s blink + cfi_adjust_cfa_offset (4) + cfi_rel_offset (blink, 0) + + mov_s r1, r12 + bl.d _dl_fixup + mov r0, r11 + + /* restore regs back. */ + ld.ab blink,[sp, 4] + cfi_adjust_cfa_offset (-4) + cfi_restore (blink) + ld.ab r9, [sp, 4] + ld.ab r8, [sp, 4] + ld.ab r7, [sp, 4] + ld.ab r6, [sp, 4] + ld.ab r5, [sp, 4] + ld.ab r4, [sp, 4] + pop_s r3 + pop_s r2 + pop_s r1 + cfi_adjust_cfa_offset (-36) + + j_s.d [r0] /* r0 has resolved function addr. */ + pop_s r0 /* restore first arg to resolved call. */ + cfi_adjust_cfa_offset (-4) + cfi_restore (r0) +END (_dl_runtime_resolve) |