0,0 → 1,104 |
/* |
* Copyright (c) 2007 Petr Stepan, Pavel Jancik |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup arm32 |
* @{ |
*/ |
/** @file |
* @brief Userspace switch. |
*/ |
|
#include <userspace.h> |
|
/** Struct for holding all general purpose registers. |
* |
* Used to set registers when going to userspace. |
*/ |
typedef struct { |
uint32_t r0; |
uint32_t r1; |
uint32_t r2; |
uint32_t r3; |
uint32_t r4; |
uint32_t r5; |
uint32_t r6; |
uint32_t r7; |
uint32_t r8; |
uint32_t r9; |
uint32_t r10; |
uint32_t r11; |
uint32_t r12; |
uint32_t sp; |
uint32_t lr; |
uint32_t pc; |
} ustate_t; |
|
/** Changes processor mode and jumps to the address specified in the first |
* parameter. |
* |
* @param kernel_uarg Userspace settings (entry point, stack, ...). |
*/ |
void userspace(uspace_arg_t *kernel_uarg) |
{ |
volatile ustate_t ustate; |
|
/* set first parameter */ |
ustate.r0 = (uintptr_t) kernel_uarg->uspace_uarg; |
|
/* clear other registers */ |
ustate.r1 = ustate.r2 = ustate.r3 = ustate.r4 = ustate.r5 = |
ustate.r6 = ustate.r7 = ustate.r8 = ustate.r9 = ustate.r10 = |
ustate.r11 = ustate.r12 = ustate.lr = 0; |
|
/* set user stack */ |
ustate.sp = ((uint32_t)kernel_uarg->uspace_stack) + PAGE_SIZE; |
|
/* set where uspace execution starts */ |
ustate.pc = (uintptr_t) kernel_uarg->uspace_entry; |
|
/* status register in user mode */ |
ipl_t user_mode = current_status_reg_read() & |
(~STATUS_REG_MODE_MASK | USER_MODE); |
|
/* set user mode, set registers, jump */ |
asm volatile ( |
"mov sp, %0 \n" |
"msr spsr_c, %1 \n" |
"ldmfd sp!, {r0-r12, sp, lr}^ \n" |
"ldmfd sp!, {pc}^\n" |
: |
: "r" (&ustate), "r" (user_mode) |
); |
|
/* unreachable */ |
while(1) |
; |
} |
|
/** @} |
*/ |