banan-os/kernel/arch/x86_64/Signal.S

.section .userspace, "ax"

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

.global signal_trampoline
signal_trampoline:
	pushq %rax
	pushq %rbx
	pushq %rcx
	pushq %rdx
	pushq %rbp
	pushq %rdi
	pushq %rsi
	pushq %r8
	pushq %r9
	pushq %r10
	pushq %r11
	pushq %r12
	pushq %r13
	pushq %r14
	pushq %r15

	movq 128(%rsp), %rdi
	movq 120(%rsp), %rax

	// align stack to 16 bytes
	movq %rsp, %rbx
	andq $0x0F, %rbx
	subq %rbx, %rsp

	call *%rax

	// restore stack
	addq %rbx, %rsp
	popq %r15
	popq %r14
	popq %r13
	popq %r12
	popq %r11
	popq %r10
	popq %r9
	popq %r8
	popq %rsi
	popq %rdi
	popq %rbp
	popq %rdx
	popq %rcx
	popq %rbx
	popq %rax

	addq $16, %rsp

	// return over red-zone
	ret $128
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/LibC: Add bareboness signals You can now call raise() to raise a signal. Signal handlers are not yet supported, but the handling works :) 2023-07-21 15:45:02 +03:00
Kernel: align userspace stacks I was getting #GP on sse instructions 2023-08-03 18:09:48 +03:00			`// stack contains`
			`// return address`
			`// signal number`
			`// signal handler`

Kernel/LibC: Add bareboness signals You can now call raise() to raise a signal. Signal handlers are not yet supported, but the handling works :) 2023-07-21 15:45:02 +03:00			`.global signal_trampoline`
			`signal_trampoline:`
			`pushq %rax`
			`pushq %rbx`
			`pushq %rcx`
			`pushq %rdx`
			`pushq %rbp`
			`pushq %rdi`
			`pushq %rsi`
			`pushq %r8`
			`pushq %r9`
			`pushq %r10`
			`pushq %r11`
			`pushq %r12`
			`pushq %r13`
			`pushq %r14`
			`pushq %r15`

			`movq 128(%rsp), %rdi`
			`movq 120(%rsp), %rax`
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`
			`movq %rsp, %rbx`
			`andq $0x0F, %rbx`
			`subq %rbx, %rsp`

Kernel/LibC: Add bareboness signals You can now call raise() to raise a signal. Signal handlers are not yet supported, but the handling works :) 2023-07-21 15:45:02 +03:00			`call *%rax`

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`
			`addq %rbx, %rsp`
Kernel/LibC: Add bareboness signals You can now call raise() to raise a signal. Signal handlers are not yet supported, but the handling works :) 2023-07-21 15:45:02 +03:00			`popq %r15`
			`popq %r14`
			`popq %r13`
			`popq %r12`
			`popq %r11`
			`popq %r10`
			`popq %r9`
			`popq %r8`
			`popq %rsi`
			`popq %rdi`
			`popq %rbp`
			`popq %rdx`
			`popq %rcx`
			`popq %rbx`
			`popq %rax`

			`addq $16, %rsp`

Kernel: align userspace stacks I was getting #GP on sse instructions 2023-08-03 18:09:48 +03:00			`// return over red-zone`
			`ret $128`