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Code Issues Releases Activity

Fusee: Add mechanism for branching back at end of hook.

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This commit is contained in:
Michael Scire 2018-06-02 19:11:50 -06:00
parent 8ec3a53d73
commit cc69079d73
1 changed files with 8 additions and 0 deletions
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8
fusee/fusee-secondary/src/kernel_patches.c
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@ -12,6 +12,7 @@ typedef struct {
const uint8_t *pattern;
size_t pattern_hook_offset;
size_t payload_num_instructions;
size_t branch_back_offset;
const instruction_t *payload;
} kernel_hook_t;
@ -71,6 +72,7 @@ static const kernel_info_t g_kernel_infos[] = {
KERNEL_HOOKS(400)
},
{ /* 5.0.0. */
.hash = {0xB2, 0x38, 0x61, 0xA8, 0xE1, 0xE2, 0xE4, 0xE4, 0x17, 0x28, 0xED, 0xA9, 0xF6, 0xF6, 0xBD, 0xD2, 0x59, 0xDB, 0x1F, 0xEF, 0x4A, 0x8B, 0x2F, 0x1C, 0x64, 0x46, 0x06, 0x40, 0xF5, 0x05, 0x9C, 0x43},
.free_code_space_offset = 0x5C020,
KERNEL_HOOKS(500)
}
@ -121,6 +123,9 @@ void package2_patch_kernel(void *_kernel, size_t size) {
size_t free_space_size = ((free_space_offset + 0xFFFULL) & ~0xFFFULL) - free_space_offset;
for (unsigned int i = 0; i < kernel_info->num_hooks; i++) {
size_t hook_size = sizeof(instruction_t) * kernel_info->hooks[i].payload_num_instructions;
if (kernel_info->hooks[i].branch_back_offset) {
hook_size += sizeof(instruction_t);
}
if (free_space_size < hook_size) {
/* TODO: What should be done in this case? */
fatal_error("kernel_patcher: insufficient space to apply patches!\n");
@ -140,6 +145,9 @@ void package2_patch_kernel(void *_kernel, size_t size) {
for (unsigned int p = 0; p < kernel_info->hooks[i].payload_num_instructions; p++) {
payload[p] = kernel_info->hooks[i].payload[p];
}
if (kernel_info->hooks[i].branch_back_offset) {
payload[kernel_info->hooks[i].payload_num_instructions] = MAKE_BRANCH(free_space_offset + sizeof(instruction_t) * kernel_info->hooks[i].payload_num_instructions, (uint32_t)(kernel_info->hooks[i].branch_back_offset + (uintptr_t)hook_start - (uintptr_t)kernel));
}
free_space_offset += hook_size;
free_space_size -= hook_size;