| 1 | #
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| 2 | # Copyright (c) 2001-2004 Jakub Jermar
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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 | .text
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| 30 |
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| 31 | .global context_save
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| 32 | .global context_restore
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| 33 |
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| 34 | #include <libarch/fibril_context.h>
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| 35 |
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| 36 | ## Save current CPU context
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| 37 | #
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| 38 | # Save CPU context to context_t variable
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| 39 | # pointed by the 1st argument. Returns 1 in EAX.
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| 40 | #
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| 41 | context_save:
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| 42 | movq (%rsp), %rdx # the caller's return %eip
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| 43 |
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| 44 | # in %rdi is passed 1st argument
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| 45 | movq %rdx, CONTEXT_OFFSET_PC(%rdi)
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| 46 | movq %rsp, CONTEXT_OFFSET_SP(%rdi)
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| 47 |
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| 48 | movq %rbx, CONTEXT_OFFSET_RBX(%rdi)
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| 49 | movq %rbp, CONTEXT_OFFSET_RBP(%rdi)
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| 50 | movq %r12, CONTEXT_OFFSET_R12(%rdi)
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| 51 | movq %r13, CONTEXT_OFFSET_R13(%rdi)
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| 52 | movq %r14, CONTEXT_OFFSET_R14(%rdi)
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| 53 | movq %r15, CONTEXT_OFFSET_R15(%rdi)
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| 54 |
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| 55 | # save TLS
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| 56 | movq %fs:0, %rax
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| 57 | movq %rax, CONTEXT_OFFSET_TLS(%rdi)
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| 58 |
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| 59 | xorl %eax, %eax # context_save returns 1
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| 60 | incl %eax
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| 61 | ret
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| 62 |
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| 63 | ## Restore current CPU context
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| 64 | #
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| 65 | # Restore CPU context from context_t variable
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| 66 | # pointed by the 1st argument. Returns 0 in EAX.
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| 67 | #
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| 68 | context_restore:
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| 69 |
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| 70 | movq CONTEXT_OFFSET_R15(%rdi), %r15
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| 71 | movq CONTEXT_OFFSET_R14(%rdi), %r14
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| 72 | movq CONTEXT_OFFSET_R13(%rdi), %r13
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| 73 | movq CONTEXT_OFFSET_R12(%rdi), %r12
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| 74 | movq CONTEXT_OFFSET_RBP(%rdi), %rbp
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| 75 | movq CONTEXT_OFFSET_RBX(%rdi), %rbx
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| 76 |
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| 77 | movq CONTEXT_OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp
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| 78 |
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| 79 | movq CONTEXT_OFFSET_PC(%rdi), %rdx
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| 80 |
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| 81 | movq %rdx,(%rsp)
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| 82 |
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| 83 | # Set thread local storage
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| 84 | movq CONTEXT_OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr
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| 85 | movl $1, %eax # SYS_TLS_SET
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| 86 | syscall
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| 87 |
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| 88 | xorl %eax, %eax # context_restore returns 0
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| 89 | ret
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| 90 |
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