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1 | /* RISC-V PLT trampoline | |
2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of the GNU C Library. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library. If not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <sysdep.h> | |
21 | #include <sys/asm.h> | |
22 | ||
23 | /* Assembler veneer called from the PLT header code for lazy loading. | |
24 | The PLT header passes its own args in t0-t2. */ | |
25 | ||
26 | #ifdef __riscv_float_abi_soft | |
27 | # define FRAME_SIZE (-((-10 * SZREG) & ALMASK)) | |
28 | #else | |
29 | # define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK)) | |
30 | #endif | |
31 | ||
32 | ENTRY (_dl_runtime_resolve) | |
33 | # Save arguments to stack. | |
34 | addi sp, sp, -FRAME_SIZE | |
35 | REG_S ra, 9*SZREG(sp) | |
36 | REG_S a0, 1*SZREG(sp) | |
37 | REG_S a1, 2*SZREG(sp) | |
38 | REG_S a2, 3*SZREG(sp) | |
39 | REG_S a3, 4*SZREG(sp) | |
40 | REG_S a4, 5*SZREG(sp) | |
41 | REG_S a5, 6*SZREG(sp) | |
42 | REG_S a6, 7*SZREG(sp) | |
43 | REG_S a7, 8*SZREG(sp) | |
44 | ||
45 | #ifndef __riscv_float_abi_soft | |
46 | FREG_S fa0, (10*SZREG + 0*SZFREG)(sp) | |
47 | FREG_S fa1, (10*SZREG + 1*SZFREG)(sp) | |
48 | FREG_S fa2, (10*SZREG + 2*SZFREG)(sp) | |
49 | FREG_S fa3, (10*SZREG + 3*SZFREG)(sp) | |
50 | FREG_S fa4, (10*SZREG + 4*SZFREG)(sp) | |
51 | FREG_S fa5, (10*SZREG + 5*SZFREG)(sp) | |
52 | FREG_S fa6, (10*SZREG + 6*SZFREG)(sp) | |
53 | FREG_S fa7, (10*SZREG + 7*SZFREG)(sp) | |
54 | #endif | |
55 | ||
56 | # Update .got.plt and obtain runtime address of callee. | |
57 | slli a1, t1, 1 | |
58 | mv a0, t0 # link map | |
59 | add a1, a1, t1 # reloc offset (== thrice the .got.plt offset) | |
60 | la a2, _dl_fixup | |
61 | jalr a2 | |
62 | mv t1, a0 | |
63 | ||
64 | # Restore arguments from stack. | |
65 | REG_L ra, 9*SZREG(sp) | |
66 | REG_L a0, 1*SZREG(sp) | |
67 | REG_L a1, 2*SZREG(sp) | |
68 | REG_L a2, 3*SZREG(sp) | |
69 | REG_L a3, 4*SZREG(sp) | |
70 | REG_L a4, 5*SZREG(sp) | |
71 | REG_L a5, 6*SZREG(sp) | |
72 | REG_L a6, 7*SZREG(sp) | |
73 | REG_L a7, 8*SZREG(sp) | |
74 | ||
75 | #ifndef __riscv_float_abi_soft | |
76 | FREG_L fa0, (10*SZREG + 0*SZFREG)(sp) | |
77 | FREG_L fa1, (10*SZREG + 1*SZFREG)(sp) | |
78 | FREG_L fa2, (10*SZREG + 2*SZFREG)(sp) | |
79 | FREG_L fa3, (10*SZREG + 3*SZFREG)(sp) | |
80 | FREG_L fa4, (10*SZREG + 4*SZFREG)(sp) | |
81 | FREG_L fa5, (10*SZREG + 5*SZFREG)(sp) | |
82 | FREG_L fa6, (10*SZREG + 6*SZFREG)(sp) | |
83 | FREG_L fa7, (10*SZREG + 7*SZFREG)(sp) | |
84 | #endif | |
85 | ||
86 | addi sp, sp, FRAME_SIZE | |
87 | ||
88 | # Invoke the callee. | |
89 | jr t1 | |
90 | END (_dl_runtime_resolve) |