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Marvin
2026-09-28 17:46:45 +02:00
committed by Marvin Friedrich
parent 09926f45ee
commit 4a20a5b0af
62 changed files with 1266 additions and 554 deletions
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arch/x86_64/syscall.c
+16 -17
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@@ -12,17 +12,17 @@
void arch_syscall_stub() {
asm volatile(
" swapgs\n"
" mov gs:%c0, rsp\n" // user_stack
" mov rsp, gs:%c1\n" // kernel_stack
" mov gs:%c[user_stack], rsp\n"
" mov rsp, gs:%c[kernel_stack]\n"
" cld\n"
"1:\n"
" push %c3\n" // ss
" push gs:%c0\n"
" push r11\n" // rflags
" push %c2\n" // cs
" push rcx\n" // rip
" push 0x00\n" // arch_context::error
" push 0x00\n" // arch_context::isr
" push %c[user_data]\n" // ss
" push gs:%c[user_stack]\n"
" push r11\n" // rflags
" push %c[user_code64]\n" // cs
" push rcx\n" // rip
" push 0x00\n" // arch_context::error
" push 0x00\n" // arch_context::isr
" push rax\n"
" push rbx\n"
" push rcx\n"
@@ -39,8 +39,8 @@ void arch_syscall_stub() {
" push r14\n"
" push r15\n"
" xor rbp, rbp\n"
" mov rdi, rsp\n" // SysV ABI first argument.
" call %4\n" // Call syscall handler.
" mov rdi, rsp\n" // SysV ABI first argument.
" call syscall_dispatch\n" // Call syscall handler.
" cli\n"
" pop r15\n"
" pop r14\n"
@@ -59,14 +59,13 @@ void arch_syscall_stub() {
" pop rax\n"
" add rsp, 0x10\n" // Skip .error and .isr fields
"2:\n"
" mov rsp, gs:%c0\n" // user_stack
" mov rsp, gs:%c[user_stack]\n"
" swapgs\n"
" sysretq\n"
:
: "i"(offsetof(struct percpu, user_stack)), // 0
"i"(offsetof(struct percpu, kernel_stack)), // 1
"i"(offsetof(struct gdt, user_code64) | CPL_USER), // 2
"i"(offsetof(struct gdt, user_data) | CPL_USER), // 3
"r"(syscall_dispatch) // 4
: [user_stack] "i"(offsetof(struct percpu, user_stack)),
[kernel_stack] "i"(offsetof(struct percpu, kernel_stack)),
[user_code64] "i"(offsetof(struct gdt, user_code64) | CPL_USER),
[user_data] "i"(offsetof(struct gdt, user_data) | CPL_USER)
);
}