| 1 | /*
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| 2 | * SPDX-FileCopyrightText: 2008 Pavel Rimsky
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| 3 | *
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| 4 | * SPDX-License-Identifier: BSD-3-Clause
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| 5 | */
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| 6 |
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| 7 | #include <abi/asmtool.h>
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| 8 | #include <arch/mm/mmu.h>
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| 9 | #include <arch/regdef.h>
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| 10 | #include <arch/stack.h>
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| 11 |
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| 12 | .text
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| 13 |
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| 14 | /** Switch to userspace.
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| 15 | *
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| 16 | * %o0 Userspace entry address.
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| 17 | * %o1 Userspace stack pointer address.
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| 18 | * %o2 Userspace address of uarg structure.
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| 19 | */
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| 20 | FUNCTION_BEGIN(switch_to_userspace)
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| 21 | save %o1, -(STACK_WINDOW_SAVE_AREA_SIZE + STACK_ARG_SAVE_AREA_SIZE), %sp
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| 22 | flushw
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| 23 | wrpr %g0, 0, %cleanwin ! avoid information leak
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| 24 |
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| 25 | mov %i2, %o0 ! uarg
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| 26 | xor %o1, %o1, %o1 ! %o1 is defined to hold pcb_ptr
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| 27 | ! set it to 0
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| 28 | clr %i2
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| 29 | clr %i3
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| 30 | clr %i4
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| 31 | clr %i5
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| 32 | clr %i6
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| 33 | wrpr %g0, 1, %tl ! enforce mapping via nucleus
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| 34 |
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| 35 | rdpr %cwp, %g1
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| 36 | wrpr %g1, TSTATE_IE_BIT, %tstate
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| 37 | wrpr %i0, 0, %tnpc
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| 38 |
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| 39 | /*
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| 40 | * Set primary context according to secondary context.
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| 41 | * Secondary context has been already installed by
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| 42 | * higher-level functions.
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| 43 | */
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| 44 | wr %g0, ASI_SECONDARY_CONTEXT_REG, %asi
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| 45 | ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
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| 46 | wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi
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| 47 | stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
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| 48 | flush %i7
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| 49 |
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| 50 | /*
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| 51 | * Spills and fills will be handled by the userspace handlers.
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| 52 | */
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| 53 | wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
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| 54 | done ! jump to userspace
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| 55 | FUNCTION_END(switch_to_userspace)
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