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Kernel: Save fpu state and flags in signal handler 

This was causing some weird crashes :D
This commit is contained in:
Bananymous 2025-06-27 21:51:13 +03:00
parent 9e895e5286
commit f73bb242f3
3 changed files with 15 additions and 4 deletions
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11
kernel/arch/i686/Signal.S
View File

@ -7,9 +7,6 @@
.global signal_trampoline
signal_trampoline:
pushl %ebp
movl %esp, %ebp
pusha
movl 40(%esp), %edi
@ -19,16 +16,22 @@ signal_trampoline:
movl %esp, %ebp
andl $-16, %esp
subl $512, %esp
fxsave (%esp)
subl $12, %esp
pushl %edi
call *%eax
addl $16, %esp
fxrstor (%esp)
addl $512, %esp
// restore stack
movl %ebp, %esp
popa
leave
addl $8, %esp
popf
ret

7
kernel/arch/x86_64/Signal.S
View File

@ -30,8 +30,14 @@ signal_trampoline:
movq %rsp, %rbp
andq $-16, %rsp
subq $512, %rsp
fxsave64 (%rsp)
call *%rax
fxrstor64 (%rsp)
addq $512, %rsp
// restore stack
movq %rbp, %rsp
popq %r15
@ -51,6 +57,7 @@ signal_trampoline:
popq %rax
addq $16, %rsp
popfq
// return over red-zone
ret $128

1
kernel/kernel/Thread.cpp
View File

@ -523,6 +523,7 @@ namespace Kernel
interrupt_stack.sp -= 128; // skip possible red-zone
#endif
write_to_stack(interrupt_stack.sp, interrupt_stack.ip);
write_to_stack(interrupt_stack.sp, interrupt_stack.flags);
write_to_stack(interrupt_stack.sp, signal);
write_to_stack(interrupt_stack.sp, signal_handler);
interrupt_stack.ip = (uintptr_t)signal_trampoline;