Changeset b067d9b for libcfa/src/concurrency/CtxSwitch-x86_64.S

Timestamp:

Oct 29, 2019, 4:01:24 PM (6 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, pthread-emulation, qualifiedEnum

Children:

773db65, 9421f3d8

Parents:

7951100 (diff), 8364209 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

File:

• libcfa/src/concurrency/CtxSwitch-x86_64.S (moved) (moved from src/libcfa/concurrency/CtxSwitch-x86_64.S ) (2 diffs)

libcfa/src/concurrency/CtxSwitch-x86_64.S

@@ -39 +39 @@
 #define SP_OFFSET       ( 0 * PTR_BYTE )
 #define FP_OFFSET       ( 1 * PTR_BYTE )
-#define PC_OFFSET       ( 2 * PTR_BYTE )
 
-.text
+//-----------------------------------------------------------------------------
+// Regular context switch routine which enables switching from one context to anouther
+        .text
         .align 2
-.globl  CtxSwitch
+        .globl CtxSwitch
+        .type  CtxSwitch, @function
 CtxSwitch:
-
-        // Save floating & SSE control words on the stack.
-
-        subq   $8,%rsp
-        stmxcsr 0(%rsp)         // 4 bytes
-        fnstcw  4(%rsp)         // 2 bytes
 
         // Save volatile registers on the stack.
@@ -78 +74 @@
         popq %r15
 
-        // Load floating & SSE control words from the stack.
-
-        fldcw   4(%rsp)
-        ldmxcsr 0(%rsp)
-        addq   $8,%rsp
-
         // Return to thread.
 
         ret
+        .size  CtxSwitch, .-CtxSwitch
 
-.text
+//-----------------------------------------------------------------------------
+// Stub used to create new stacks which are ready to be context switched to
+        .text
         .align 2
-.globl  CtxInvokeStub
+        .globl CtxInvokeStub
+        .type    CtxInvokeStub, @function
 CtxInvokeStub:
         movq %rbx, %rdi
         jmp *%r12
+        .size  CtxInvokeStub, .-CtxInvokeStub
 
 // Local Variables: //