mango/libmango/arch/x86_64/syscall.S

#include "mango/syscall.h"

# Registers:
#  rax = syscall ID + return value
#  rdi = 1st parameter
#  rsi = 2nd parameter
#  rdx = 3rd parameter
#  r12 = 4th parameter
#  r8  = 5th parameter
#  r9  = 6th parameter
#  r13 = 7th parameter
#  r14 = 8th parameter
.macro SYSCALL_GATE name index args
.global \name
.type \name, @function
\name:
    push %rbp
    mov %rsp, %rbp

    # Syscall ID
    mov $\index, %rax

    # The syscall instruction uses rcx, so move this parameter to r12
    .if \args >= 4
        pushq %r12
        movq %rcx, %r12
    .endif

    # r13 and r14 are callee-saved so we save it beforehand
    .if \args >= 7
        pushq %r13
        movq 16(%rbp), %r13
    .endif

    .if \args >= 8
        pushq %r14
        movq 24(%rbp), %r14
    .endif

    syscall

    .if \args >= 8
        popq %r14
    .endif

    .if \args >= 7
        popq %r13
    .endif

    .if \args >= 4
        popq %r12
    .endif

    pop %rbp
    ret
.endm

SYSCALL_GATE task_exit SYS_TASK_EXIT 1
SYSCALL_GATE task_create SYS_TASK_CREATE 5
SYSCALL_GATE task_create_thread SYS_TASK_CREATE_THREAD 6

SYSCALL_GATE thread_start SYS_THREAD_START 1

SYSCALL_GATE vm_object_create SYS_VM_OBJECT_CREATE 5
SYSCALL_GATE vm_object_read SYS_VM_OBJECT_READ 5
SYSCALL_GATE vm_object_write SYS_VM_OBJECT_WRITE 5
SYSCALL_GATE vm_object_copy SYS_VM_OBJECT_COPY 6

SYSCALL_GATE vm_region_create SYS_VM_REGION_CREATE 8
SYSCALL_GATE vm_region_read SYS_VM_REGION_READ 5
SYSCALL_GATE vm_region_write SYS_VM_REGION_WRITE 5
SYSCALL_GATE vm_region_map_absolute SYS_VM_REGION_MAP_ABSOLUTE 7
SYSCALL_GATE vm_region_map_relative SYS_VM_REGION_MAP_RELATIVE 7
SYSCALL_GATE vm_region_unmap_absolute SYS_VM_REGION_UNMAP_ABSOLUTE 3
SYSCALL_GATE vm_region_unmap_relative SYS_VM_REGION_UNMAP_RELATIVE 3

SYSCALL_GATE kern_log SYS_KERN_LOG 1
SYSCALL_GATE kern_handle_close SYS_KERN_HANDLE_CLOSE 1
SYSCALL_GATE kern_config_get SYS_KERN_CONFIG_GET 3
SYSCALL_GATE kern_config_set SYS_KERN_CONFIG_SET 3

SYSCALL_GATE channel_create SYS_CHANNEL_CREATE 3
SYSCALL_GATE port_create SYS_PORT_CREATE 1
SYSCALL_GATE port_connect SYS_PORT_CONNECT 3
SYSCALL_GATE port_disconnect SYS_PORT_DISCONNECT 1
SYSCALL_GATE msg_send SYS_MSG_SEND 4
SYSCALL_GATE msg_recv SYS_MSG_RECV 4
SYSCALL_GATE msg_reply SYS_MSG_REPLY 4
SYSCALL_GATE msg_read SYS_MSG_READ 5
SYSCALL_GATE msg_read_handles SYS_MSG_READ_HANDLES 5
SYSCALL_GATE msg_write SYS_MSG_WRITE 5
SYSCALL_GATE msg_write_handles SYS_MSG_WRITE_HANDLES 5