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Implemented the basis for syscalls

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A software interrupt with vector 0x50 will cause a syscall to start executing.
The EAX register will hold the syscall_num.
Other registers and the stack can be used to hold further arguments.
This commit is contained in:
Nigel Barink
2023-02-27 00:34:30 +01:00
parent 2d0bb16fad
commit 5781f730d9
7 changed files with 141 additions and 143 deletions
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6
kernel/irs_table.s
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@ -53,7 +53,7 @@ ISR_NOERRORCODE 28 $28
ISR_NOERRORCODE 29 $29
ISR_NOERRORCODE 30 $30
ISR_NOERRORCODE 31 $31
ISR_NOERRORCODE 50 $50
irs_common:
pusha # Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
@ -74,7 +74,7 @@ irs_common:
call irs_handler
pop %eax
pop %eax // pop stack pointer
pop %ebx // reload ther orignal data segment descriptor
mov %bx, %ds
mov %bx, %es
@ -82,6 +82,6 @@ irs_common:
mov %bx, %gs
popa
add $12, %esp # cleans push error and irs code
add $8, %esp # cleans push error and irs code
iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP