nicolas
/
copapy
mirror of https://github.com/Nonannet/copapy.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

PATCH_OBJECT_ARM32_ABS patching added to support 32 bit ARM

This commit is contained in:
Nicolas 2025-11-17 09:00:23 +01:00 committed by Nicolas Kruse
parent bf089d7f7e
commit 96a1a153d4
3 changed files with 40 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/copapy/_binwrite.py
View File

@ -10,6 +10,7 @@ Command = Enum('Command', [('ALLOCATE_DATA', 1), ('COPY_DATA', 2),
('PATCH_OBJECT_HI21', 0x2001),
('PATCH_OBJECT_ABS', 0x2002),
('PATCH_OBJECT_REL', 0x2003),
('PATCH_OBJECT_ARM32_ABS', 0x2004),
('ENTRY_POINT', 7),
('RUN_PROG', 64), ('READ_DATA', 65),
('END_COM', 256), ('FREE_MEMORY', 257), ('DUMP_CODE', 258)])

42
src/coparun/runmem.c
View File

@ -40,6 +40,30 @@ void patch_hi21(uint8_t *patch_addr, int32_t page_offset) {
*(uint32_t *)patch_addr = instr;
}
void patch_arm32_abs(uint8_t *patch_addr, uint32_t imm16)
{
uint32_t i = (imm16 >> 11) & 0x1;
uint32_t imm4 = (imm16 >> 12) & 0xF;
uint32_t imm3 = (imm16 >> 8) & 0x7;
uint32_t imm8 = imm16 & 0xFF;
uint32_t instr = *((uint32_t *)patch_addr);
// Clear the fields we are going to replace:
// imm4 → bits 19:16
// imm3 → bits 14:12
// i → bit 26
// imm8 → bits 7:0
instr &= ~(uint32_t)((0xF << 16) | (0x7 << 12) | (1 << 26) | 0xFF);
instr |= (imm4 << 16);
instr |= (imm3 << 12);
instr |= (i << 26);
instr |= (imm8);
*((uint32_t *)patch_addr) = instr;
}
void free_memory() {
deallocate_memory(executable_memory, executable_memory_len);
deallocate_memory(data_memory, data_memory_len);
@ -141,7 +165,7 @@ int parse_commands(uint8_t *bytes) {
case PATCH_OBJECT_REL:
offs = *(uint32_t*)bytes; bytes += 4;
patch_mask = *(uint32_t*)bytes; bytes += 4;
bytes += 4;
patch_scale = *(int32_t*)bytes; bytes += 4;
value = *(int32_t*)bytes; bytes += 4;
LOG("PATCH_OBJECT_REL patch_offs=%i patch_addr=%p scale=%i value=%i\n",
@ -150,13 +174,23 @@ int parse_commands(uint8_t *bytes) {
break;
case PATCH_OBJECT_HI21:
offs = *(uint32_t*)bytes; bytes += 4;
bytes += 4;
patch_scale = *(int32_t*)bytes; bytes += 4;
value = *(int32_t*)bytes; bytes += 4;
LOG("PATCH_OBJECT_HI21 patch_offs=%i scale=%i value=%i res_value=%i\n",
offs, patch_scale, value, floor_div(data_offs + value, patch_scale) - (int32_t)offs / patch_scale);
patch_hi21(executable_memory + offs, floor_div(data_offs + value, patch_scale) - (int32_t)offs / patch_scale);
break;
case PATCH_OBJECT_ARM32_ABS:
offs = *(uint32_t*)bytes; bytes += 4;
patch_mask = *(uint32_t*)bytes; bytes += 4;
patch_scale = *(int32_t*)bytes; bytes += 4;
value = *(int32_t*)bytes; bytes += 4;
LOG("PATCH_OBJECT_HI21 patch_offs=%i patch_mask=%#08x scale=%i value=%i res_value=%i\n",
offs, patch_mask, patch_scale, value, floor_div(data_offs + value, patch_scale) - (int32_t)offs / patch_scale);
patch_hi21(executable_memory + offs, floor_div(data_offs + value, patch_scale) - (int32_t)offs / patch_scale);
LOG("PATCH_OBJECT_MOVW_ABS patch_offs=%i value=%i\n",
offs, value);
patch_arm32_abs(executable_memory + offs, (uint32_t)((uintptr_t)(data_memory + value) & patch_mask) / (uint32_t)patch_scale);
break;
case ENTRY_POINT:

1
src/coparun/runmem.h
View File

@ -24,6 +24,7 @@
#define PATCH_OBJECT_HI21 0x2001
#define PATCH_OBJECT_ABS 0x2002
#define PATCH_OBJECT_REL 0x2003
#define PATCH_OBJECT_ARM32_ABS 0x2004
#define ENTRY_POINT 7
#define RUN_PROG 64
#define READ_DATA 65