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libcfa/src/concurrency/CtxSwitch-x86_64.S (modified) (2 diffs)
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libcfa/src/concurrency/CtxSwitch-x86_64.S
rbf71cfd r63364d8 39 39 #define SP_OFFSET ( 0 * PTR_BYTE ) 40 40 #define FP_OFFSET ( 1 * PTR_BYTE ) 41 #define PC_OFFSET ( 2 * PTR_BYTE )42 41 43 .text 42 //----------------------------------------------------------------------------- 43 // Regular context switch routine which enables switching from one context to anouther 44 .text 44 45 .align 2 45 .globl CtxSwitch 46 .globl CtxSwitch 47 .type CtxSwitch, @function 46 48 CtxSwitch: 47 48 // Save floating & SSE control words on the stack.49 50 subq $8,%rsp51 stmxcsr 0(%rsp) // 4 bytes52 fnstcw 4(%rsp) // 2 bytes53 49 54 50 // Save volatile registers on the stack. … … 78 74 popq %r15 79 75 80 // Load floating & SSE control words from the stack.81 82 fldcw 4(%rsp)83 ldmxcsr 0(%rsp)84 addq $8,%rsp85 86 76 // Return to thread. 87 77 88 78 ret 79 .size CtxSwitch, .-CtxSwitch 89 80 90 .text 81 //----------------------------------------------------------------------------- 82 // Stub used to create new stacks which are ready to be context switched to 83 .text 91 84 .align 2 92 .globl CtxInvokeStub 85 .globl CtxInvokeStub 86 .type CtxInvokeStub, @function 93 87 CtxInvokeStub: 94 88 movq %rbx, %rdi 95 89 jmp *%r12 90 .size CtxInvokeStub, .-CtxInvokeStub 96 91 97 92 // Local Variables: //
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