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run_main_entry: Rewrite in asm for stack setup

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- Fixes OpenOrbis loading that depends on rsp
  pointing to the argument structure, in addition
  to rdi
This commit is contained in:
Stefanos Kornilios Mitsis Poiitidis 2023-10-02 17:17:29 +03:00
parent f52b0ad01d
commit 5094d3044c
1 changed files with 22 additions and 2 deletions
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24
src/Core/PS4/Linker.cpp
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@ -640,8 +640,28 @@ static PS4_SYSV_ABI void ProgramExitFunc() {
printf("exit function called\n");
}
static PS4_SYSV_ABI void run_main_entry(u64 addr, EntryParams* params, exit_func_t exit_func) {
reinterpret_cast<entry_func_t>(addr)(params, exit_func);
static void run_main_entry(u64 addr, EntryParams* params, exit_func_t exit_func) {
//reinterpret_cast<entry_func_t>(addr)(params, exit_func); // can't be used, stack has to have a specific layout
asm volatile (
"andq $-16, %%rsp\n"// Align to 16 bytes
"subq $8, %%rsp\n" // videoout_basic expects the stack to be misaligned
// Kernel also pushes some more things here during process init
// at least: environment, auxv, possibly other things
"pushq 8(%1)\n" // copy EntryParams to top of stack like the kernel does
"pushq 0(%1)\n" // OpenOrbis expects to find it there
"movq %1, %%rdi\n" // also pass params and exit func
"movq %2, %%rsi\n" // as before
"jmp *%0\n" // can't use call here, as that would mangle the prepared stack.
// there's no coming back
:
: "r"(addr), "r"(params), "r"(exit_func)
: "rax", "rsi", "rdi", "rsp", "rbp"
);
}
void Linker::Execute()