source: mainline/uspace/lib/c/arch/amd64/src/fibril.S@ 8624d1f

Last change on this file since 8624d1f was cb7be8f, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 4 years ago

Update headers in .S files that incorrectly use #-style comments

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*
2 * SPDX-FileCopyrightText: 2001-2004 Jakub Jermar
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7#include <abi/asmtool.h>
8#include <libarch/fibril_context.h>
9
10.text
11
12## Save current CPU context
13#
14# Save CPU context to context_t variable
15# pointed by the 1st argument. Returns 0 in RAX.
16#
17FUNCTION_BEGIN(__context_save)
18 movq (%rsp), %rdx # the caller's return %eip
19
20 # in %rdi is passed 1st argument
21 movq %rdx, __CONTEXT_OFFSET_PC(%rdi)
22 movq %rsp, __CONTEXT_OFFSET_SP(%rdi)
23
24 movq %rbx, __CONTEXT_OFFSET_RBX(%rdi)
25 movq %rbp, __CONTEXT_OFFSET_RBP(%rdi)
26 movq %r12, __CONTEXT_OFFSET_R12(%rdi)
27 movq %r13, __CONTEXT_OFFSET_R13(%rdi)
28 movq %r14, __CONTEXT_OFFSET_R14(%rdi)
29 movq %r15, __CONTEXT_OFFSET_R15(%rdi)
30
31 movq %fs:0, %rax
32 movq %rax, __CONTEXT_OFFSET_TLS(%rdi)
33
34 xorq %rax, %rax # __context_save returns 0
35 ret
36FUNCTION_END(__context_save)
37
38## Restore current CPU context
39#
40# Restore CPU context from context_t variable
41# pointed by the 1st argument. Returns second argument in RAX.
42#
43FUNCTION_BEGIN(__context_restore)
44 movq __CONTEXT_OFFSET_R15(%rdi), %r15
45 movq __CONTEXT_OFFSET_R14(%rdi), %r14
46 movq __CONTEXT_OFFSET_R13(%rdi), %r13
47 movq __CONTEXT_OFFSET_R12(%rdi), %r12
48 movq __CONTEXT_OFFSET_RBP(%rdi), %rbp
49 movq __CONTEXT_OFFSET_RBX(%rdi), %rbx
50
51 movq __CONTEXT_OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp
52
53 movq __CONTEXT_OFFSET_PC(%rdi), %rdx
54
55 movq %rdx,(%rsp)
56
57 movq __CONTEXT_OFFSET_TLS(%rdi), %rdi
58 movq %rdi, %fs:0
59
60 movq %rsi, %rax # __context_restore returns second argument
61 ret
62FUNCTION_END(__context_restore)
63
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