# # Copyright (c) 2001-2004 Jakub Jermar # 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. # #include #include #include .text ## Save current CPU context # # Save CPU context to context_t variable # pointed by the 1st argument. Returns 1 in EAX. # FUNCTION_BEGIN(context_save_arch) movq (%rsp), %rdx # the caller's return %rip movq %rdx, CONTEXT_OFFSET_PC(%rdi) movq %rsp, CONTEXT_OFFSET_SP(%rdi) movq %rbx, CONTEXT_OFFSET_RBX(%rdi) movq %rbp, CONTEXT_OFFSET_RBP(%rdi) movq %r12, CONTEXT_OFFSET_R12(%rdi) movq %r13, CONTEXT_OFFSET_R13(%rdi) movq %r14, CONTEXT_OFFSET_R14(%rdi) movq %r15, CONTEXT_OFFSET_R15(%rdi) #ifdef MEMORY_MODEL_large movabsq $vreg_ptr, %rsi movq (%rsi), %rsi #else movq vreg_ptr, %rsi #endif movq %fs:VREG_TP(%rsi), %rsi movq %rsi, CONTEXT_OFFSET_TP(%rdi) xorl %eax, %eax # context_save returns 1 incl %eax ret FUNCTION_END(context_save_arch) ## Restore current CPU context # # Restore CPU context from context_t variable # pointed by the 1st argument. Returns 0 in EAX. # FUNCTION_BEGIN(context_restore_arch) movq CONTEXT_OFFSET_R15(%rdi), %r15 movq CONTEXT_OFFSET_R14(%rdi), %r14 movq CONTEXT_OFFSET_R13(%rdi), %r13 movq CONTEXT_OFFSET_R12(%rdi), %r12 movq CONTEXT_OFFSET_RBP(%rdi), %rbp movq CONTEXT_OFFSET_RBX(%rdi), %rbx movq CONTEXT_OFFSET_SP(%rdi), %rsp movq CONTEXT_OFFSET_PC(%rdi), %rdx movq %rdx, (%rsp) movq CONTEXT_OFFSET_TP(%rdi), %rcx #ifdef MEMORY_MODEL_large movabsq $vreg_ptr, %rsi movq (%rsi), %rsi #else movq vreg_ptr, %rsi #endif movq %rcx, %fs:VREG_TP(%rsi) xorl %eax, %eax # context_restore returns 0 ret FUNCTION_END(context_restore_arch)