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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2021 Tintri by DDN, Inc. All rights reserved.
*/
/*
* Get the stack at entry and call a function with it as an argument.
*/
.file "stack_amd64.s"
#include <sys/asm_linkage.h>
/*
* void
* get_stack_at_entry(test_ctx_t *ctx)
*
* ctx+0 is void (*)(uintptr_t stack, char *text),
* and ctx+8 is the 'text' argument.
*
* Passes the stack pointer prior to the invoking call instruction
* to the specified function.
*/
ENTRY(get_stack_at_entry)
pushq %rbp
movq %rsp, %rbp
movq %rdi, %rax
leaq 16(%rbp), %rdi
movq 8(%rax), %rsi
call *(%rax)
popq %rbp
ret
SET_SIZE(get_stack_at_entry)
/*
* void
* get_stack_at_init(void)
*
* Passes the stack pointer prior to the invoking call instruction
* to initarray() (defined elsewhere).
* Tests alignment in section .init_array.
*/
ENTRY(get_stack_at_init)
pushq %rbp
movq %rsp, %rbp
leaq 16(%rbp), %rdi
call initarray@PLT
popq %rbp
ret
SET_SIZE(get_stack_at_init)
/*
* Passes the stack pointer during init to initmain() (defined elsewhere).
* Tests alignment in section .init.
*/
.section ".init"
movq %rsp, %rdi
call initmain@PLT
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