| 1 | /*
|
|---|
| 2 | * Copyright (c) 2010 Martin Decky
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 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
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 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
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 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
|
|---|
| 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
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup sparc32
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #include <userspace.h>
|
|---|
| 36 | #include <typedefs.h>
|
|---|
| 37 | #include <arch.h>
|
|---|
| 38 | #include <arch/asm.h>
|
|---|
| 39 | #include <abi/proc/uarg.h>
|
|---|
| 40 | #include <mm/as.h>
|
|---|
| 41 |
|
|---|
| 42 | void userspace(uspace_arg_t *kernel_uarg)
|
|---|
| 43 | {
|
|---|
| 44 | uint32_t psr = psr_read();
|
|---|
| 45 | psr &= ~(1 << 7);
|
|---|
| 46 | psr &= ~(1 << 6);
|
|---|
| 47 |
|
|---|
| 48 | /* Read invalid window variables */
|
|---|
| 49 | uint32_t l0;
|
|---|
| 50 | uint32_t l1;
|
|---|
| 51 | uint32_t l2;
|
|---|
| 52 | read_from_invalid(&l0, &l1, &l2);
|
|---|
| 53 |
|
|---|
| 54 | /* Make current window invalid */
|
|---|
| 55 | uint8_t wim = (psr & 0x7) + 1;
|
|---|
| 56 | wim = (1 << wim) | (1 >> (8 - wim));
|
|---|
| 57 |
|
|---|
| 58 | asm volatile (
|
|---|
| 59 | "flush\n"
|
|---|
| 60 | "mov %[stack], %%sp\n"
|
|---|
| 61 | "mov %[wim], %%wim\n"
|
|---|
| 62 | "ld %[v0], %%o0\n"
|
|---|
| 63 | "ld %[v1], %%o1\n"
|
|---|
| 64 | "ld %[v2], %%o2\n"
|
|---|
| 65 | "call write_to_invalid\n"
|
|---|
| 66 | "nop\n"
|
|---|
| 67 | "ld %[arg], %%o1\n"
|
|---|
| 68 | "jmp %[entry]\n"
|
|---|
| 69 | "mov %[psr], %%psr\n"
|
|---|
| 70 | :: [entry] "r" (kernel_uarg->uspace_entry),
|
|---|
| 71 | [arg] "m" (kernel_uarg->uspace_uarg),
|
|---|
| 72 | [psr] "r" (psr),
|
|---|
| 73 | [wim] "r" ((uint32_t)wim),
|
|---|
| 74 | [v0] "m" (l0),
|
|---|
| 75 | [v1] "m" (l1),
|
|---|
| 76 | [v2] "m" (l2),
|
|---|
| 77 | [stack] "r" (kernel_uarg->uspace_stack +
|
|---|
| 78 | kernel_uarg->uspace_stack_size - 64)
|
|---|
| 79 | : "%g3", "%g4"
|
|---|
| 80 | );
|
|---|
| 81 |
|
|---|
| 82 | while (1);
|
|---|
| 83 | }
|
|---|
| 84 |
|
|---|
| 85 | /** @}
|
|---|
| 86 | */
|
|---|
