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1/* Create new context.
2 Copyright (C) 2005-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#include <abort-instr.h>
21
22#include "ucontext_i.h"
23
24/* void __makecontext (ucontext_t *ucp, void (*func)(), int argc, ...);
25 __makecontext sets up a stack and registers for context to run a given
26 function. The registers are set up like this:
27 r4-r7: parameters 1 to 4
28 r8 : uc_link from ucontext structure
29 pc : (*func) pointer
30 pr : address of exitcode
31 r15 : stack pointer for func. */
32
33 .text
34 .align 5
35ENTRY(__makecontext)
36 mov #4, r3
37 mov.l @(oSS_SP,r4), r1 /* r1 <- ucb->stack_base */
38 mov.l @(oSS_SIZE,r4), r2 /* r2 <- ucb->stack_size */
39 add r1, r2 /* r2 <- stack_top */
40 cmp/gt r3, r6 /* argc > 4? */
41 bf/s 1f
42 shlr2 r2 /* r2 <- stack_top / 4 */
43 sub r6, r2
44 add r3, r2
451:
46 shll2 r2 /* r2 <- stack_top - ((argc > 4) ? 4 * (argc - 4) : 0 */
47 mov #oR15, r0
48 mov.l @(oLINK,r4), r1
49 mov.l r2, @(r0,r4) /* ucp->r15 <- r2 */
50 mov.l r1, @(oR8,r4) /* ucp->r8 <- ucp->uc_link */
51 mov #oPC, r0
52 mov.l r5, @(r0,r4) /* ucp->PC <- func */
53
54 cmp/pl r6 /* argc > 0? */
55 bf/s .L1
56 dt r6
57 mov.l r7, @(oR4,r4) /* ucp->r4 <- argv[0] */
58 cmp/pl r6 /* argc > 1? */
59 bf/s .L1
60 dt r6
61 mov.l @(0,r15), r1
62 mov.l r1, @(oR5,r4) /* ucp->r5 <- argv[1] */
63 cmp/pl r6 /* argc > 2? */
64 bf/s .L1
65 dt r6
66 mov.l @(4,r15), r1
67 mov.l r1, @(oR6,r4) /* ucp->r6 <- argv[2] */
68 cmp/pl r6 /* argc > 3? */
69 bf/s .L1
70 dt r6
71 mov.l @(8,r15), r1
72 mov.l r1, @(oR7,r4) /* ucp->r7 <- argv[3] */
73 mov #12,r0
74.L0: /* Save remaining argv[] on the stack. */
75 cmp/pl r6
76 bf/s .L1
77 dt r6
78 mov.l @(r0,r15), r1
79 mov.l r1, @r2
80 add #4, r0
81 bra .L0
82 add #4, r2
83.L1:
84#ifdef PIC
85 mova .Lexitcode, r0
86#else
87 mov.l .L2, r0
88#endif
89 add #oPR, r4
90 rts
91 mov.l r0, @r4 /* ucp->pr <- exitcode */
92#ifndef PIC
93 .align 2
94.L2:
95 .long .Lexitcode
96#endif
97 cfi_endproc
98
99 .align 5
100 cfi_startproc
101.Lexitcode:
102#ifdef PIC
103 mov.l r12, @-r15
104 cfi_adjust_cfa_offset (4)
105 cfi_rel_offset (r12, 0)
106 mova .Lgot, r0
107 mov.l .Lgot, r12
108 add r0, r12
109#endif
110 tst r8, r8 /* ucb->uc_link == NULL? */
111 bt/s 2f
112 mov r8, r4 /* r4 <- ucb->uc_link */
113 mov.l .Lsetcontext, r1
114 sts.l pr, @-r15
115 cfi_adjust_cfa_offset (4)
116 cfi_rel_offset (pr, 0)
117#ifdef PIC
118 bsrf r1
119.LPCS0:
120 nop
121#else
122 jsr @r1
123 nop
124#endif
125 /* Restore to keep CFI/CFA balanced. */
126 lds.l @r15+, pr
127 cfi_adjust_cfa_offset (-4)
128 cfi_restore (pr)
129 /* If this returns (which can happen if the syscall fails) we'll exit
130 the program with the return error value (-1). */
131 mov r0, r4
132
1332:
134 mov.l .Lexit, r1
135#ifdef PIC
136 add r12, r1
137#endif
138 jsr @r1
139 nop
140 /* The 'exit' call should never return. In case it does cause the
141 process to terminate. */
142 ABORT_INSTRUCTION_ASM
143
144 .align 2
145#ifdef PIC
146.Lgot:
147 .long _GLOBAL_OFFSET_TABLE_
148.Lsetcontext:
149 .long __setcontext@PLT-(.LPCS0+2-(.))
150.Lexit:
151 .long HIDDEN_JUMPTARGET(exit)@GOTOFF
152#else
153.Lsetcontext:
154 .long __setcontext
155.Lexit:
156 .long HIDDEN_JUMPTARGET(exit)
157#endif
158PSEUDO_END(__makecontext)
159
160weak_alias (__makecontext, makecontext)
161

Warning: That file was not part of the compilation database. It may have many parsing errors.