projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 8d9254fc | 1 | /* Copyright (C) 2013-2020 Free Software Foundation, Inc. |
| e430824f CLT |
2 | Contributed by Altera and Mentor Graphics, Inc. |
| 3 | ||
| 4 | This file is free software; you can redistribute it and/or modify it | |
| 5 | under the terms of the GNU General Public License as published by the | |
| 6 | Free Software Foundation; either version 3, or (at your option) any | |
| 7 | later version. | |
| 8 | ||
| 9 | This file is distributed in the hope that it will be useful, but | |
| 10 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | General Public License for more details. | |
| 13 | ||
| 14 | Under Section 7 of GPL version 3, you are granted additional | |
| 15 | permissions described in the GCC Runtime Library Exception, version | |
| 16 | 3.1, as published by the Free Software Foundation. | |
| 17 | ||
| 18 | You should have received a copy of the GNU General Public License and | |
| 19 | a copy of the GCC Runtime Library Exception along with this program; | |
| 20 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 21 | <http://www.gnu.org/licenses/>. */ | |
| 22 | ||
| 23 | /* Set up trampolines. | |
| 24 | R12 is the static chain register. | |
| 25 | R2 is AT, the assembler temporary. | |
| 26 | The trampoline code looks like: | |
| 27 | movhi r12,%hi(chain) | |
| 28 | ori r12,%lo(chain) | |
| 29 | movhi r2,%hi(fn) | |
| 30 | ori r2,%lo(fn) | |
| 31 | jmp r2 | |
| 32 | */ | |
| 33 | ||
| 34 | #define SC_REGNO 12 | |
| 35 | ||
| a03c6ae3 SL |
36 | /* Instruction encodings depend on the ISA level. */ |
| 37 | #if __nios2_arch__ == 2 | |
| 38 | #define MOVHI(reg,imm16) \ | |
| 39 | (((reg) << 11) | ((imm16) << 16) | 0x34) | |
| 40 | #define ORI(reg,imm16) \ | |
| 41 | (((reg) << 11) | ((reg) << 6) | ((imm16) << 16) | 0x14) | |
| 42 | #define JMP(reg) \ | |
| 43 | (((reg) << 6) | (0x0d << 26) | 0x20) | |
| 44 | ||
| 45 | #elif __nios2_arch__ == 1 | |
| 46 | #define MOVHI(reg,imm16) \ | |
| e430824f | 47 | (((reg) << 22) | ((imm16) << 6) | 0x34) |
| a03c6ae3 | 48 | #define ORI(reg,imm16) \ |
| e430824f | 49 | (((reg) << 27) | ((reg) << 22) | ((imm16) << 6) | 0x14) |
| a03c6ae3 | 50 | #define JMP(reg) \ |
| e430824f CLT |
51 | (((reg) << 27) | (0x0d << 11) | 0x3a) |
| 52 | ||
| a03c6ae3 SL |
53 | #else |
| 54 | #error "Unknown Nios II architecture level" | |
| 55 | #endif | |
| 56 | ||
| e430824f CLT |
57 | void |
| 58 | __trampoline_setup (unsigned int *addr, void *fnptr, void *chainptr) | |
| 59 | { | |
| 60 | unsigned int fn = (unsigned int) fnptr; | |
| 61 | unsigned int chain = (unsigned int) chainptr; | |
| 62 | int i; | |
| 63 | ||
| 64 | addr[0] = MOVHI (SC_REGNO, ((chain >> 16) & 0xffff)); | |
| 65 | addr[1] = ORI (SC_REGNO, (chain & 0xffff)); | |
| 66 | addr[2] = MOVHI (2, ((fn >> 16) & 0xffff)); | |
| 67 | addr[3] = ORI (2, (fn & 0xffff)); | |
| 68 | addr[4] = JMP (2); | |
| 69 | ||
| 70 | /* Flush the caches. | |
| 71 | See Example 9-4 in the Nios II Software Developer's Handbook. */ | |
| 72 | for (i = 0; i < 5; i++) | |
| 73 | asm volatile ("flushd 0(%0); flushi %0" :: "r"(addr + i) : "memory"); | |
| 74 | asm volatile ("flushp" ::: "memory"); | |
| 75 | } |