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Preserve r2/r13 on kern_write

This commit is contained in:
Maschell 2023-03-26 11:48:24 +02:00
parent 4ecaee8deb
commit 9a9ece838d
1 changed files with 6 additions and 0 deletions
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6
source/main.cpp
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@ -142,6 +142,9 @@ void KernelReadSRs(sr_table_t *table) {
/* Write a 32-bit word with kernel permissions */
void __attribute__((noinline)) kern_write(void *addr, uint32_t value) {
asm volatile(
"stwu 1, -0x10(1)\n"
"stw 2, 0x08(1)\n"
"stw 13, 0x0C(1)\n"
"li 3,1\n"
"li 4,0\n"
"mr 5,%1\n"
@ -154,6 +157,9 @@ void __attribute__((noinline)) kern_write(void *addr, uint32_t value) {
"sc\n"
"nop\n"
"mr 1,%1\n"
"lwz 2, 0x8(1)\n"
"lwz 13, 0xC(1)\n"
"addi 1, 1, 0x10\n"
:
: "r"(addr), "r"(value)
: "memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10",