diff options
Diffstat (limited to 'kernel/arch/aarch64/h_execregs.S')
| -rw-r--r-- | kernel/arch/aarch64/h_execregs.S | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/kernel/arch/aarch64/h_execregs.S b/kernel/arch/aarch64/h_execregs.S new file mode 100644 index 000000000000..f060911067f4 --- /dev/null +++ b/kernel/arch/aarch64/h_execregs.S @@ -0,0 +1,84 @@ +/* $NetBSD: h_execregs.S,v 1.2 2025/04/25 12:58:40 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#define _LOCORE + +#include <sys/syscall.h> + +#include <machine/asm.h> + +#include "execregs.h" + +ENTRY(execregs_start) + /* create a stack frame with NEXECREGS*8 bytes, aligned to 16-byte */ + stp fp, lr, [sp, #-(16 + ((NEXECREGS*8 + 15)/16)*16)]! + + /* store registers to buffer on stack */ + stp x0, x1, [sp, #16] /* order matches execregs.h */ + /* x2: ps_strings */ + stp x3, x4, [sp, #(16 + 1*2*8)] + stp x5, x6, [sp, #(16 + 2*2*8)] + stp x7, x8, [sp, #(16 + 3*2*8)] + stp x9, x10, [sp, #(16 + 4*2*8)] + stp x11, x12, [sp, #(16 + 5*2*8)] + stp x13, x14, [sp, #(16 + 6*2*8)] + stp x15, x16, [sp, #(16 + 7*2*8)] + stp x17, x18, [sp, #(16 + 8*2*8)] + stp x19, x20, [sp, #(16 + 9*2*8)] + stp x21, x22, [sp, #(16 + 10*2*8)] + stp x23, x24, [sp, #(16 + 11*2*8)] + stp x25, x26, [sp, #(16 + 12*2*8)] + stp x27, x28, [sp, #(16 + 13*2*8)] + stp x29, x30, [sp, #(16 + 14*2*8)] + mrs x0, tpidr_el0 + str x0, [sp, #(16 + 15*2*8)] + + /* call write(STDOUT_FILENO, regs, sizeof(regs)) */ + mov x0, #1 /* arg0 := STDOUT_FILENO */ + add x1, sp, #16 /* arg1 := regs */ + mov x2, #(NEXECREGS*8) /* arg2 := sizeof(regs) */ + svc #SYS_write + + b.cs 2f /* bail if write failed */ + cmp x0, #(NEXECREGS*8) /* bail if wrote wrong # of bytes */ + b.ne 2f + + /* call exit(0) */ + mov x0, #0 /* arg0 := 0 */ +1: svc #SYS_exit + brk #0xffff /* paranoia */ + +2: /* call exit(127) */ + mov x0, #127 /* arg0 := 127 */ + b 1b +END(execregs_start) + +/* main stub to simplify linking */ +ENTRY(main) + brk #0xffff +END(main) |