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[rpcsx-os] Use xbyak to set context

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DH 2023-07-18 03:26:33 +03:00
parent 0d86217715
commit adacb8daa6
3 changed files with 26 additions and 11 deletions
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3
.gitmodules vendored Normal file
View file

@ -0,0 +1,3 @@
[submodule "3rdparty/xbyak"]
path = 3rdparty/xbyak
url = git@github.com:herumi/xbyak.git

1
3rdparty/xbyak vendored Submodule

@ -0,0 +1 @@
Subproject commit ce083a0dcc306c1717685a81f577a4e050193919

33
rpcsx-os/thread.cpp
View file

@ -10,9 +10,30 @@
#include <sys/prctl.h>
#include <ucontext.h>
#include <unistd.h>
#include <xbyak/xbyak.h>
thread_local orbis::Thread *rx::thread::g_current = nullptr;
static auto setContext = [] {
struct SetContext : Xbyak::CodeGenerator {
SetContext() {
mov(rbp, rdi);
mov(rax, qword[rbp + REG_RAX * sizeof(unsigned long long)]);
mov(rdi, qword[rbp + REG_RDI * sizeof(unsigned long long)]);
mov(rdx, qword[rbp + REG_RDX * sizeof(unsigned long long)]);
mov(rcx, qword[rbp + REG_RCX * sizeof(unsigned long long)]);
mov(rbx, qword[rbp + REG_RBX * sizeof(unsigned long long)]);
mov(rsi, qword[rbp + REG_RSI * sizeof(unsigned long long)]);
mov(rsp, qword[rbp + REG_RSP * sizeof(unsigned long long)]);
mov(rbp, qword[rbp + REG_RIP * sizeof(unsigned long long)]);
call(rbp);
}
} static setContextStorage;
return setContextStorage.getCode<void (*)(const mcontext_t &)>();
}();
static __attribute__((no_stack_protector)) void
handleSigSys(int sig, siginfo_t *info, void *ucontext) {
if (auto hostFs = _readgsbase_u64()) {
@ -63,16 +84,6 @@ void rx::thread::invoke(orbis::Thread *thread) {
_writefsbase_u64(thread->fsBase);
auto context = reinterpret_cast<ucontext_t *>(thread->context);
asm volatile("movq %1, %%rsp\n"
"callq *%0\n"
:
: "rm"(context->uc_mcontext.gregs[REG_RIP]),
"rm"(context->uc_mcontext.gregs[REG_RSP]),
"D"(context->uc_mcontext.gregs[REG_RDI]),
"S"(context->uc_mcontext.gregs[REG_RSI]),
"d"(context->uc_mcontext.gregs[REG_RDX]),
"c"(context->uc_mcontext.gregs[REG_RCX]),
"b"(context->uc_mcontext.gregs[REG_RBX])
: "memory");
setContext(context->uc_mcontext);
_writefsbase_u64(hostFs);
}