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28 | 28 | ||
29 | /** @addtogroup arm32 |
29 | /** @addtogroup arm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief Userspace. |
33 | * @brief Userspace switch. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <userspace.h> |
36 | #include <userspace.h> |
37 | 37 | ||
- | 38 | ||
38 | /** Struct to hold general purpose register values */ |
39 | /** Struct for holding all general purpose registers. |
- | 40 | * |
|
- | 41 | * Used to set registers when going to userspace. |
|
- | 42 | */ |
|
39 | typedef struct { |
43 | typedef struct { |
40 | uint32_t r0; |
44 | uint32_t r0; |
41 | uint32_t r1; |
45 | uint32_t r1; |
42 | uint32_t r2; |
46 | uint32_t r2; |
43 | uint32_t r3; |
47 | uint32_t r3; |
Line 72... | Line 76... | ||
72 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = |
76 | ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = |
73 | ustate.r5 = ustate.r6 = ustate.r7 = ustate.r8 = |
77 | ustate.r5 = ustate.r6 = ustate.r7 = ustate.r8 = |
74 | ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = |
78 | ustate.r9 = ustate.r10 = ustate.r11 = ustate.r12 = |
75 | ustate.lr = 0; |
79 | ustate.lr = 0; |
76 | 80 | ||
77 | //set user stack |
81 | // set user stack |
78 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + |
82 | ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
79 | PAGE_SIZE - sizeof(void*); |
- | |
80 | 83 | ||
81 | //set where uspace execution starts |
84 | // set where uspace execution starts |
82 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
85 | ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
83 | 86 | ||
84 | //status register in user mode |
87 | // status register in user mode |
85 | ipl_t cpsr = current_status_reg_read(); |
- | |
86 | cpsr &= ~STATUS_REG_MODE_MASK | USER_MODE; |
- | |
87 | - | ||
88 | ipl_t tmpsr = (cpsr & ~STATUS_REG_MODE_MASK) | SUPERVISOR_MODE; |
88 | ipl_t user_mode = current_status_reg_read() & (~STATUS_REG_MODE_MASK | USER_MODE); |
89 | 89 | ||
- | 90 | // set user mode, set registers, jump |
|
90 | asm __volatile__ ( |
91 | asm __volatile__ ( |
91 | // save pointer into ustate struct |
- | |
92 | "mov r0, %0 \n" |
92 | "mov r0, %0 \n" |
93 | // save cspr |
- | |
94 | "mov r1, %1 \n" |
- | |
95 | // change mode into any exception mode |
- | |
96 | "msr cpsr_c, %2 \n" |
- | |
97 | // set saved cpsr |
- | |
98 | "msr spsr_c, r1 \n" |
93 | "msr spsr_c, %1 \n" |
99 | - | ||
100 | "mov sp, r0 \n" |
- | |
101 | // replace almost all registers |
- | |
102 | "ldmfd sp!, {r0-r12, sp, lr}^\n" |
94 | "ldmfd r0!, {r0-r12, sp, lr}^ \n" |
103 | //jump to the usermode |
- | |
104 | "ldmfd sp!, {pc}^" |
95 | "ldmfd r0!, {pc}^" |
- | 96 | ||
105 | : // no output |
97 | : |
106 | : "r"(&ustate), "r"(cpsr), "r"(tmpsr) // |
98 | : "r"(&ustate), "r"(user_mode) |
107 | : "r0","r1" |
99 | : "r0", "r1" |
108 | ); |
100 | ); |
109 | 101 | ||
110 | // unreachable |
102 | // unreachable |
111 | while(1) ; |
103 | while(1) ; |
112 | } |
104 | } |