diff options
| author | dzwdz | 2021-07-23 13:50:00 +0200 |
|---|---|---|
| committer | dzwdz | 2021-07-23 13:50:00 +0200 |
| commit | 8a29c78d34f1924c4e39a3a951b36c4512ffe9c1 (patch) | |
| tree | 624319a6dd15593be381c48d03ef5c8b568020a0 /src/kernel/arch/i386/sysenter.s | |
| parent | 91c637d847744ba410cbf0e20c62c485e1f6153d (diff) | |
update the process' EIP/ESP when it syscalls
Diffstat (limited to 'src/kernel/arch/i386/sysenter.s')
| -rw-r--r-- | src/kernel/arch/i386/sysenter.s | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/kernel/arch/i386/sysenter.s b/src/kernel/arch/i386/sysenter.s index 7375e06..64b7d01 100644 --- a/src/kernel/arch/i386/sysenter.s +++ b/src/kernel/arch/i386/sysenter.s @@ -49,6 +49,8 @@ sysenter_setup: sysenter_handler: pushal + push %edx + push %ecx push %edi push %esi push %ebx @@ -61,13 +63,13 @@ sysenter_handler: call syscall_handler // save the return value - mov %eax, 44(%esp) // 16 [top of eflags] + 7*4 [skip until EAX] - mov %edx, 32(%esp) // 16 + 4*4 [skip until EBX] + mov %eax, 52(%esp) // 24 [top of eflags] + 7*4 [skip until EAX] + mov %edx, 40(%esp) // 24 + 4*4 [skip until EBX] mov %cr0, %eax or $0x80000000, %eax // enable paging mov %eax, %cr0 - add $16, %esp + add $24, %esp popal sysexit |