| 1 | /*
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| 2 | * Copyright (c) 2010 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup abs32le
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <userspace.h>
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| 36 | #include <typedefs.h>
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| 37 | #include <arch.h>
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| 38 | #include <arch/asm.h>
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| 39 | #include <abi/proc/uarg.h>
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| 40 | #include <mm/as.h>
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| 41 |
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| 42 | void userspace(uspace_arg_t *kernel_uarg)
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| 43 | {
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| 44 | // printf("userspace(): entry=%p, stack=%p, stacksize=%d\n", kernel_uarg->uspace_entry, kernel_uarg->uspace_stack, kernel_uarg->uspace_stack_size);
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| 45 | /* On real hardware this switches the CPU to user
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| 46 | space mode and jumps to kernel_uarg->uspace_entry. */
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| 47 |
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| 48 | uint32_t l0, l1, l2;
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| 49 | uint32_t psr = psr_read();
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| 50 | uint8_t wim;
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| 51 |
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| 52 | psr &= ~(1 << 7);
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| 53 | psr &= ~(1 << 6);
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| 54 |
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| 55 | /* Read invalid window variables */
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| 56 | read_from_invalid(&l0, &l1, &l2);
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| 57 |
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| 58 | /* Make current window invalid */
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| 59 | wim = (psr & 0x7) + 1;
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| 60 | wim = (1 << wim) | (1 >> (8 - wim));
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| 61 |
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| 62 | asm volatile (
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| 63 | "flush\n"
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| 64 | "mov %[stack], %%sp\n"
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| 65 | "mov %[wim], %%wim\n"
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| 66 | "ld %[v0], %%o0\n"
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| 67 | "ld %[v1], %%o1\n"
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| 68 | "ld %[v2], %%o2\n"
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| 69 | "call write_to_invalid\n"
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| 70 | "nop\n"
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| 71 | "ld %[arg], %%o1\n"
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| 72 | "jmp %[entry]\n"
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| 73 | "mov %[psr], %%psr\n" :: [entry] "r" (kernel_uarg->uspace_entry),
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| 74 | [arg] "m" (kernel_uarg->uspace_uarg),
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| 75 | [psr] "r" (psr),
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| 76 | [wim] "r" ((uint32_t)wim),
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| 77 | [v0] "m" (l0),
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| 78 | [v1] "m" (l1),
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| 79 | [v2] "m" (l2),
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| 80 | [stack] "r" (kernel_uarg->uspace_stack + kernel_uarg->uspace_stack_size - 64) : "%g3", "%g4");
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| 81 |
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| 82 | while (true);
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| 83 | }
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| 84 |
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| 85 | /** @}
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| 86 | */
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