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| 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 | - | ||
| 39 | /** Struct for holding all general purpose registers. |
38 | /** Struct for holding all general purpose registers. |
| 40 | * |
39 | * |
| 41 | * Used to set registers when going to userspace. |
40 | * Used to set registers when going to userspace. |
| 42 | */ |
41 | */ |
| 43 | typedef struct { |
42 | typedef struct { |
| 44 | uint32_t r0; |
43 | uint32_t r0; |
| 45 | uint32_t r1; |
44 | uint32_t r1; |
| 46 | uint32_t r2; |
45 | uint32_t r2; |
| 47 | uint32_t r3; |
46 | uint32_t r3; |
| 48 | uint32_t r4; |
47 | uint32_t r4; |
| 49 | uint32_t r5; |
48 | uint32_t r5; |
| 50 | uint32_t r6; |
49 | uint32_t r6; |
| 51 | uint32_t r7; |
50 | uint32_t r7; |
| 52 | uint32_t r8; |
51 | uint32_t r8; |
| 53 | uint32_t r9; |
52 | uint32_t r9; |
| 54 | uint32_t r10; |
53 | uint32_t r10; |
| 55 | uint32_t r11; |
54 | uint32_t r11; |
| 56 | uint32_t r12; |
55 | uint32_t r12; |
| 57 | uint32_t sp; |
56 | uint32_t sp; |
| 58 | uint32_t lr; |
57 | uint32_t lr; |
| 59 | uint32_t pc; |
58 | uint32_t pc; |
| 60 | } ustate_t; |
59 | } ustate_t; |
| 61 | 60 | ||
| 62 | - | ||
| 63 | /** Changes processor mode and jumps to the address specified in the first parameter. |
61 | /** Changes processor mode and jumps to the address specified in the first |
| - | 62 | * parameter. |
|
| 64 | * |
63 | * |
| 65 | * @param kernel_uarg Userspace settings (entry point, stack, ...). |
64 | * @param kernel_uarg Userspace settings (entry point, stack, ...). |
| 66 | */ |
65 | */ |
| 67 | void userspace(uspace_arg_t *kernel_uarg) |
66 | void userspace(uspace_arg_t *kernel_uarg) |
| 68 | { |
67 | { |
| 69 | - | ||
| 70 | volatile ustate_t ustate; |
68 | volatile ustate_t ustate; |
| 71 | 69 | ||
| 72 | // set first parameter |
70 | /* set first parameter */ |
| 73 | ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg; |
71 | ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg; |
| 74 | 72 | ||
| 75 | // clear other registers |
73 | /* clear other registers */ |
| 76 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = |
74 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = ustate.r5 = |
| 77 | ustate.r5 = ustate.r6 = ustate.r7 = ustate.r8 = |
75 | ustate.r6 = ustate.r7 = ustate.r8 = ustate.r9 = ustate.r10 = |
| 78 | ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = |
76 | ustate.r11 = ustate.r12 = ustate.lr = 0; |
| 79 | ustate.lr = 0; |
- | |
| 80 | 77 | ||
| 81 | // set user stack |
78 | /* set user stack */ |
| 82 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
79 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
| 83 | 80 | ||
| 84 | // set where uspace execution starts |
81 | /* set where uspace execution starts */ |
| 85 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
82 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
| 86 | 83 | ||
| 87 | // status register in user mode |
84 | /* status register in user mode */ |
| 88 | ipl_t user_mode = current_status_reg_read() & (~STATUS_REG_MODE_MASK | USER_MODE); |
85 | ipl_t user_mode = current_status_reg_read() & |
| - | 86 | (~STATUS_REG_MODE_MASK | USER_MODE); |
|
| 89 | 87 | ||
| 90 | // set user mode, set registers, jump |
88 | /* set user mode, set registers, jump */ |
| 91 | asm __volatile__ ( |
89 | asm volatile ( |
| 92 | "mov r0, %0 \n" |
90 | "mov r0, %0 \n" |
| 93 | "msr spsr_c, %1 \n" |
91 | "msr spsr_c, %1 \n" |
| 94 | "ldmfd r0!, {r0-r12, sp, lr}^ \n" |
92 | "ldmfd r0!, {r0-r12, sp, lr}^ \n" |
| 95 | "ldmfd r0!, {pc}^" |
93 | "ldmfd r0!, {pc}^\n" |
| 96 | - | ||
| 97 | : |
94 | : |
| 98 | : "r"(&ustate), "r"(user_mode) |
95 | : "r" (&ustate), "r" (user_mode) |
| 99 | : "r0", "r1" |
96 | : "r0", "r1" |
| 100 | ); |
97 | ); |
| 101 | 98 | ||
| 102 | // unreachable |
99 | /* unreachable */ |
| 103 | while(1) ; |
100 | while(1) |
| - | 101 | ; |
|
| 104 | } |
102 | } |
| 105 | 103 | ||
| 106 | - | ||
| 107 | /** @} |
104 | /** @} |
| 108 | */ |
105 | */ |
| 109 | 106 | ||