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| author | Ada Christine <adachristine18@gmail.com> | 2025-01-27 02:05:07 +0000 |
|---|---|---|
| committer | Ada Christine <adachristine18@gmail.com> | 2025-01-27 02:05:07 +0000 |
| commit | 0d2ddecc9aeb232746b76b4eebdb1381053a8951 (patch) | |
| tree | 31fe2fc38ead88a0d982b06b3783aae4f094b8ad /boot/fake_syscall_entry.S | |
| parent | 6faeb8d3aed797ddfac66ecc21fc8a717d5e848a (diff) | |
checkpoint. we can fake syscall with the dummy gdt
Diffstat (limited to 'boot/fake_syscall_entry.S')
| -rw-r--r-- | boot/fake_syscall_entry.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/boot/fake_syscall_entry.S b/boot/fake_syscall_entry.S new file mode 100644 index 0000000..ff2428d --- /dev/null +++ b/boot/fake_syscall_entry.S @@ -0,0 +1,25 @@ +.section .text + +.extern fake_syscall_handler + +.global fake_syscall_entry +fake_syscall_entry: + hlt + +.global fake_syscall_return +fake_syscall_return: + cli + mov %rdi, %rsp + lgdt (%rsp) + add $16, %rsp + + movw (%rsp), %ds + movw (%rsp), %es + movw (%rsp), %fs + movw (%rsp), %gs + movw (%rsp), %ss + + add $8, %rsp + + lretq + |