diff options
Diffstat (limited to 'arch/x86_64/syscall_entry.c')
-rw-r--r-- | arch/x86_64/syscall_entry.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86_64/syscall_entry.c b/arch/x86_64/syscall_entry.c new file mode 100644 index 0000000..56dedce --- /dev/null +++ b/arch/x86_64/syscall_entry.c @@ -0,0 +1,25 @@ +#include "arch/processor.h" +#include "syscall/handler.h" + +__attribute__((naked)) +void _syscall_entry() +{ + __asm__ volatile(" \ + pushq %%r11; \ + pushq %%rcx; \ + swapgs; \ + movq %%gs:%c[tcb], %%rax; \ + movq %%rsp, %c[sp](%%rax); \ + movq %c[ksp](%%rax), %%rsp; \ + pushq %c[sp](%%rax); \ + callq _syscall_handler; \ + swapgs; \ + popq %%rsp; \ + popq %%rcx; \ + popq %%r11; \ + sysretq; \ + " + :: [tcb] "i"(offsetof(processor_t, tcb)), + [sp] "i"(offsetof(tcb_t, sp)), + [ksp] "i"(offsetof(tcb_t, ksp))); +} |