Changeset 7b2c2c5f


Ignore:
Timestamp:
Mar 9, 2017, 3:49:30 PM (5 years ago)
Author:
Thierry Delisle <tdelisle@…>
Branches:
aaron-thesis, arm-eh, cleanup-dtors, deferred_resn, demangler, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, resolv-new, with_gc
Children:
149d297
Parents:
5222605
Message:

Fixed saving and loading of control words for i386

Location:
src/libcfa/concurrency
Files:
3 edited

Legend:

Unmodified
Added
Removed
  • src/libcfa/concurrency/CtxSwitch-i386.S

    r5222605 r7b2c2c5f  
    5252        movl 4(%esp),%eax
    5353
     54        // Save floating & SSE control words on the stack.
     55
     56        sub    $8,%esp
     57        stmxcsr 0(%esp)         // 4 bytes
     58        fnstcw  4(%esp)         // 2 bytes
     59
    5460        // Save volatile registers on the stack.
    5561
     
    6975        // argument is now at 8 + 12 = 20(%esp)
    7076
    71         movl 20(%esp),%eax
     77        movl 28(%esp),%eax
    7278
    7379        // Load new context from the "to" area.
     
    8187        popl %edi
    8288        popl %ebx
     89
     90        // Load floating & SSE control words from the stack.
     91
     92        fldcw   4(%esp)
     93        ldmxcsr 0(%esp)
     94        add    $8,%esp
    8395
    8496        // Return to thread.
  • src/libcfa/concurrency/CtxSwitch-x86_64.S

    r5222605 r7b2c2c5f  
    4747CtxSwitch:
    4848
    49         // Save volatile registers on the stack.
     49        // Save floating & SSE control words on the stack.
    5050
    5151        subq   $8,%rsp
    5252        stmxcsr 0(%rsp)         // 4 bytes
    5353        fnstcw  4(%rsp)         // 2 bytes
     54
     55        // Save volatile registers on the stack.
     56
    5457        pushq %r15
    5558        pushq %r14
     
    7578        popq %r14
    7679        popq %r15
     80
     81        // Load floating & SSE control words from the stack.
     82
    7783        fldcw   4(%rsp)
    7884        ldmxcsr 0(%rsp)
    79         addq $8,%rsp
     85        addq   $8,%rsp
    8086
    8187        // Return to thread.
  • src/libcfa/concurrency/invoke.c

    r5222605 r7b2c2c5f  
    9191        struct FakeStack {
    9292            void *fixedRegisters[3];                    // fixed registers ebx, edi, esi (popped on 1st uSwitch, values unimportant)
    93             void *rturn;                                      // where to go on return from uSwitch
     93            uint32_t mxcr;                              // SSE Status and Control bits (control bits are preserved across function calls)
     94            uint16_t fcw;                               // X97 FPU control word (preserved across function calls)
     95            void *rturn;                                // where to go on return from uSwitch
    9496            void *dummyReturn;                          // fake return compiler would have pushed on call to uInvoke
    9597            void *argument[3];                          // for 16-byte ABI, 16-byte alignment starts here
     
    108110      struct FakeStack {
    109111            void *fixedRegisters[5];                    // fixed registers rbx, r12, r13, r14, r15
    110             uint32_t mxcr;                                  // SSE Status and Control bits (control bits are preserved across function calls)
    111             uint16_t fcw;                                   // X97 FPU control word (preserved across function calls)
    112             void *rturn;                                      // where to go on return from uSwitch
     112            uint32_t mxcr;                              // SSE Status and Control bits (control bits are preserved across function calls)
     113            uint16_t fcw;                               // X97 FPU control word (preserved across function calls)
     114            void *rturn;                                // where to go on return from uSwitch
    113115            void *dummyReturn;                          // NULL return address to provide proper alignment
    114116      };
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