Rev 2465 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 2465 | Rev 2477 | ||
---|---|---|---|
1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Petr Stepan, Pavel Jancik |
2 | * Copyright (c) 2007 Petr Stepan, Pavel Jancik |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup arm32 |
29 | /** @addtogroup arm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief Userspace switch. |
33 | * @brief Userspace switch. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <userspace.h> |
36 | #include <userspace.h> |
37 | 37 | ||
38 | /** Struct for holding all general purpose registers. |
38 | /** Struct for holding all general purpose registers. |
39 | * |
39 | * |
40 | * Used to set registers when going to userspace. |
40 | * Used to set registers when going to userspace. |
41 | */ |
41 | */ |
42 | typedef struct { |
42 | typedef struct { |
43 | uint32_t r0; |
43 | uint32_t r0; |
44 | uint32_t r1; |
44 | uint32_t r1; |
45 | uint32_t r2; |
45 | uint32_t r2; |
46 | uint32_t r3; |
46 | uint32_t r3; |
47 | uint32_t r4; |
47 | uint32_t r4; |
48 | uint32_t r5; |
48 | uint32_t r5; |
49 | uint32_t r6; |
49 | uint32_t r6; |
50 | uint32_t r7; |
50 | uint32_t r7; |
51 | uint32_t r8; |
51 | uint32_t r8; |
52 | uint32_t r9; |
52 | uint32_t r9; |
53 | uint32_t r10; |
53 | uint32_t r10; |
54 | uint32_t r11; |
54 | uint32_t r11; |
55 | uint32_t r12; |
55 | uint32_t r12; |
56 | uint32_t sp; |
56 | uint32_t sp; |
57 | uint32_t lr; |
57 | uint32_t lr; |
58 | uint32_t pc; |
58 | uint32_t pc; |
59 | } ustate_t; |
59 | } ustate_t; |
60 | 60 | ||
61 | /** Changes processor mode and jumps to the address specified in the first |
61 | /** Changes processor mode and jumps to the address specified in the first |
62 | * parameter. |
62 | * parameter. |
63 | * |
63 | * |
64 | * @param kernel_uarg Userspace settings (entry point, stack, ...). |
64 | * @param kernel_uarg Userspace settings (entry point, stack, ...). |
65 | */ |
65 | */ |
66 | void userspace(uspace_arg_t *kernel_uarg) |
66 | void userspace(uspace_arg_t *kernel_uarg) |
67 | { |
67 | { |
68 | volatile ustate_t ustate; |
68 | volatile ustate_t ustate; |
69 | 69 | ||
70 | /* set first parameter */ |
70 | /* set first parameter */ |
71 | ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg; |
71 | ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg; |
72 | 72 | ||
73 | /* clear other registers */ |
73 | /* clear other registers */ |
74 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = ustate.r5 = |
74 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = ustate.r5 = |
75 | ustate.r6 = ustate.r7 = ustate.r8 = ustate.r9 = ustate.r10 = |
75 | ustate.r6 = ustate.r7 = ustate.r8 = ustate.r9 = ustate.r10 = |
76 | ustate.r11 = ustate.r12 = ustate.lr = 0; |
76 | ustate.r11 = ustate.r12 = ustate.lr = 0; |
77 | 77 | ||
78 | /* set user stack */ |
78 | /* set user stack */ |
79 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
79 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
80 | 80 | ||
81 | /* set where uspace execution starts */ |
81 | /* set where uspace execution starts */ |
82 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
82 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
83 | 83 | ||
84 | /* status register in user mode */ |
84 | /* status register in user mode */ |
85 | ipl_t user_mode = current_status_reg_read() & |
85 | ipl_t user_mode = current_status_reg_read() & |
86 | (~STATUS_REG_MODE_MASK | USER_MODE); |
86 | (~STATUS_REG_MODE_MASK | USER_MODE); |
87 | 87 | ||
88 | /* set user mode, set registers, jump */ |
88 | /* set user mode, set registers, jump */ |
89 | asm volatile ( |
89 | asm volatile ( |
90 | "mov r0, %0 \n" |
90 | "mov sp, %0 \n" |
91 | "msr spsr_c, %1 \n" |
91 | "msr spsr_c, %1 \n" |
92 | "ldmfd r0!, {r0-r12, sp, lr}^ \n" |
92 | "ldmfd sp!, {r0-r12, sp, lr}^ \n" |
93 | "ldmfd r0!, {pc}^\n" |
93 | "ldmfd sp!, {pc}^\n" |
94 | : |
94 | : |
95 | : "r" (&ustate), "r" (user_mode) |
95 | : "r" (&ustate), "r" (user_mode) |
96 | : "r0", "r1" |
- | |
97 | ); |
96 | ); |
98 | 97 | ||
99 | /* unreachable */ |
98 | /* unreachable */ |
100 | while(1) |
99 | while(1) |
101 | ; |
100 | ; |
102 | } |
101 | } |
103 | 102 | ||
104 | /** @} |
103 | /** @} |
105 | */ |
104 | */ |
106 | 105 |