| 1 | /* PLT trampolines. ARC version. |
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| 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | #include <libc-symbols.h> |
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| 21 | |
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| 22 | #include <sysdep.h> |
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| 23 | #include <sys/syscall.h> |
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| 24 | |
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| 25 | /* resolver has atypical calling ABI (r11 and r12) |
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| 26 | PLTn which lands us here, sets up |
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| 27 | r11 = Module info (tpnt pointer as expected by resolver) |
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| 28 | r12 = PC of the PLTn itself - needed by resolver to find |
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| 29 | corresponding .rela.plt entry. */ |
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| 30 | |
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| 31 | ENTRY (_dl_runtime_resolve) |
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| 32 | |
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| 33 | /* save args to func being resolved before entering resolver. */ |
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| 34 | push_s r0 |
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| 35 | push_s r1 |
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| 36 | push_s r2 |
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| 37 | push_s r3 |
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| 38 | st.a r4, [sp, -4] |
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| 39 | st.a r5, [sp, -4] |
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| 40 | st.a r6, [sp, -4] |
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| 41 | st.a r7, [sp, -4] |
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| 42 | st.a r8, [sp, -4] |
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| 43 | st.a r9, [sp, -4] |
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| 44 | cfi_adjust_cfa_offset (40) |
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| 45 | push_s blink |
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| 46 | cfi_adjust_cfa_offset (4) |
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| 47 | cfi_rel_offset (blink, 0) |
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| 48 | |
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| 49 | mov_s r1, r12 |
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| 50 | bl.d _dl_fixup |
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| 51 | mov r0, r11 |
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| 52 | |
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| 53 | /* restore regs back. */ |
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| 54 | ld.ab blink,[sp, 4] |
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| 55 | cfi_adjust_cfa_offset (-4) |
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| 56 | cfi_restore (blink) |
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| 57 | ld.ab r9, [sp, 4] |
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| 58 | ld.ab r8, [sp, 4] |
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| 59 | ld.ab r7, [sp, 4] |
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| 60 | ld.ab r6, [sp, 4] |
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| 61 | ld.ab r5, [sp, 4] |
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| 62 | ld.ab r4, [sp, 4] |
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| 63 | pop_s r3 |
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| 64 | pop_s r2 |
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| 65 | pop_s r1 |
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| 66 | cfi_adjust_cfa_offset (-36) |
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| 67 | |
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| 68 | j_s.d [r0] /* r0 has resolved function addr. */ |
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| 69 | pop_s r0 /* restore first arg to resolved call. */ |
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| 70 | cfi_adjust_cfa_offset (-4) |
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| 71 | cfi_restore (r0) |
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| 72 | END (_dl_runtime_resolve) |
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| 73 | |
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