banan-os/kernel/arch/i686/Signal.S

.section .userspace, "ax"

// stack contains
//    return address
//    signal number
//    signal handler

.global signal_trampoline
signal_trampoline:
	pushl %ebp
	movl %esp, %ebp

	pusha

	movl 40(%esp), %edi
	movl 36(%esp), %eax

	// align stack to 16 bytes
	movl %esp, %ebx
	andl $0x0F, %ebx
	subl %ebx, %esp

	subl $12, %esp
	pushl %edi
	call *%eax
	addl $16, %esp

	// restore stack
	addl %ebx, %esp
	popa

	leave
	addl $8, %esp

	ret
Kernel: Don't load AP init code to 0xF000, but relocate it later This cleans up the kernel executable as bootloaders don't have to load AP init code straight to 0xF000, but it will be moved there once kernel is doing the AP initialization. 2024-08-21 13:37:50 +03:00			`.section .userspace, "ax"`
Kernel: Implement signal trampoline for i386 2024-03-22 15:33:39 +02:00
			`// stack contains`
			`// return address`
			`// signal number`
			`// signal handler`

			`.global signal_trampoline`
			`signal_trampoline:`
			`pushl %ebp`
			`movl %esp, %ebp`

			`pusha`

			`movl 40(%esp), %edi`
			`movl 36(%esp), %eax`

Kernel: Fix signal trampoline 32 bit did not even support it and 64 bit did not align stack 2024-04-18 13:32:40 +03:00			`// align stack to 16 bytes`
			`movl %esp, %ebx`
			`andl $0x0F, %ebx`
			`subl %ebx, %esp`

Kernel: Implement signal trampoline for i386 2024-03-22 15:33:39 +02:00			`subl $12, %esp`
			`pushl %edi`
			`call *%eax`
			`addl $16, %esp`

Kernel: Fix signal trampoline 32 bit did not even support it and 64 bit did not align stack 2024-04-18 13:32:40 +03:00			`// restore stack`
			`addl %ebx, %esp`
Kernel: Implement signal trampoline for i386 2024-03-22 15:33:39 +02:00			`popa`

			`leave`
			`addl $8, %esp`

			`ret`