ref: 3d078d5439e93a3dfc4b808ab6bf02805d455ff8
dir: /rt/start-netbsd.s/
.section .note.netbsd.ident .long 7 .long 4 .long 1 .ascii "NetBSD\0" .p2align 2 .long 200000000 .data /* sys.__cenvp : byte## */ .globl sys$__cenvp sys$__cenvp: .quad 0 .text /* * The entry point for the whole program. * This is called by the OS. In order, it: * - Sets up all argc entries as slices * - Converts argc/argv to a slice * - Stashes a raw envp copy in __cenvp (for syscalls to use) * - Calls main() */ .globl _start _start: movq %rsp,%rbp andq $-16,%rsp /* align the stack pointer */ /* load argc, argv, envp from stack */ movq (%rbp),%rax /* argc */ leaq 8(%rbp),%rbx /* argv */ leaq 16(%rbp,%rax,8),%rcx /* envp = argv + 8*argc + 8 */ /* store envp for some syscalls to use without converting */ movq %rcx,sys$__cenvp(%rip) /* stack allocate sizeof(byte[:])*argc */ imulq $16,%rax,%rdx subq %rdx,%rsp movq %rsp,%rcx /* args[:] */ /* convert argc, argv to byte[:][:] for args. */ pushq %rax pushq %rcx call cvt xorq %rbp,%rbp /* call pre-main initializers */ call __init__ /* enter the main program */ call main /* exit(0) */ xorq %rdi,%rdi movq $1,%rax syscall