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| 1 /* |
| 2 * Copyright 2012 The Native Client Authors. All rights reserved. |
| 3 * Use of this source code is governed by a BSD-style license that can |
| 4 * be found in the LICENSE file. |
| 5 */ |
| 6 |
| 7 #include <string.h> |
| 8 |
| 9 #include "native_client/src/include/nacl_assert.h" |
| 10 #include "native_client/src/shared/platform/nacl_check.h" |
| 11 #include "native_client/src/trusted/service_runtime/nacl_globals.h" |
| 12 #include "native_client/src/trusted/service_runtime/sel_ldr.h" |
| 13 #include "native_client/src/trusted/service_runtime/arch/mips/sel_ldr_mips.h" |
| 14 #include "native_client/src/trusted/service_runtime/arch/mips/tramp_mips.h" |
| 15 |
| 16 |
| 17 /* |
| 18 * NOTE: the trampoline organization for MIPS is currenly assuming |
| 19 * NACL_TRAMPOLINE_SIZE == 32. This is contrary to the bundle size |
| 20 * which is 16. |
| 21 */ |
| 22 |
| 23 /* |
| 24 * Install a syscall trampoline at target_addr. NB: Thread-safe. |
| 25 * The code being patched is from tramp.S |
| 26 */ |
| 27 void NaClPatchOneTrampoline(struct NaClApp *nap, |
| 28 uintptr_t target_addr) { |
| 29 struct NaClPatchInfo patch_info; |
| 30 uint16_t upper, lower; |
| 31 char *tramp_ptr = (char *)&NaCl_trampoline_seg_code; |
| 32 void (*funcptr)(void) = NaClSyscallSeg; |
| 33 uint32_t func_addr = (uint32_t) funcptr; |
| 34 unsigned long tramp_buffer[8]; |
| 35 size_t tramp_size = ((uintptr_t) &NaCl_trampoline_seg_end |
| 36 - (uintptr_t) &NaCl_trampoline_seg_code); |
| 37 |
| 38 UNREFERENCED_PARAMETER(nap); |
| 39 |
| 40 /* |
| 41 * We copy trampoline code to buffer so that we can patch it with address |
| 42 * of NaClSyscallSeg. |
| 43 */ |
| 44 |
| 45 ASSERT_MSG(tramp_size <= 8 * sizeof(unsigned long), |
| 46 "Trampoline size is bigger than tramp_buffer size"); |
| 47 |
| 48 memcpy(tramp_buffer, tramp_ptr, tramp_size); |
| 49 |
| 50 /* |
| 51 * For MIPS we do not need to patch ds, cs segments. |
| 52 */ |
| 53 |
| 54 NaClPatchInfoCtor(&patch_info); |
| 55 |
| 56 /* |
| 57 * We break address of NaClSyscallSeg into upper and lower 16 bits, so that |
| 58 * we can patch first and second instruction of trampoline respectively. |
| 59 */ |
| 60 |
| 61 upper = (uint16_t) (func_addr >> 16); |
| 62 lower = (uint16_t) (func_addr & 0xffff); |
| 63 |
| 64 tramp_buffer[0] = (tramp_buffer[0] & (0xFFFF0000)) | upper; |
| 65 tramp_buffer[1] = (tramp_buffer[1] & (0xFFFF0000)) | lower; |
| 66 |
| 67 patch_info.dst = target_addr; |
| 68 patch_info.src = (uintptr_t) tramp_buffer; |
| 69 patch_info.nbytes = ((uintptr_t) &NaCl_trampoline_seg_end |
| 70 - (uintptr_t) &NaCl_trampoline_seg_code); |
| 71 |
| 72 NaClApplyPatchToMemory(&patch_info); |
| 73 } |
| 74 |
| 75 void NaClFillMemoryRegionWithHalt(void *start, size_t size) { |
| 76 uint32_t *inst = (uint32_t *) start; |
| 77 uint32_t i; |
| 78 |
| 79 CHECK(sizeof *inst == NACL_HALT_LEN); |
| 80 CHECK(0 == size % NACL_HALT_LEN); |
| 81 /* |
| 82 * Check that the region start is 4 bytes aligned. |
| 83 */ |
| 84 CHECK(0 == (uint32_t) start % NACL_HALT_LEN); |
| 85 |
| 86 for (i = 0; i < (size / NACL_HALT_LEN); i++) |
| 87 inst[i] = NACL_HALT_OPCODE; |
| 88 } |
| 89 |
| 90 |
| 91 void NaClFillTrampolineRegion(struct NaClApp *nap) { |
| 92 NaClFillMemoryRegionWithHalt((void *)(nap->mem_start + NACL_TRAMPOLINE_START), |
| 93 NACL_TRAMPOLINE_SIZE); |
| 94 } |
| 95 |
| 96 void NaClLoadSpringboard(struct NaClApp *nap) { |
| 97 UNREFERENCED_PARAMETER(nap); |
| 98 } |
| 99 |
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