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67 lines
1.7 KiB
67 lines
1.7 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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.text
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.globl One
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.type One, @function
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One:
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/*
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* We force the thread to get an ASYNC_BREAK on this instruction, which is the
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* target of an indirect jump.
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*/
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jmp *%rdi
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/*
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* The tool should change the PC to Two() when the ASYNC_BREAK occurs, so the
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* rest of this function should be skipped.
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*/
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movl $1, %eax
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ret
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.globl Two
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.type Two, @function
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Two:
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movl $2, %eax
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ret
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.globl GetValue
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.type GetValue, @function
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GetValue:
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call *%rdi
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ret
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.globl Breakpoint
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.type Breakpoint, @function
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Breakpoint:
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mov $0, %rax
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.L1:
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add $1, %rax
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cmp $99999999, %rax
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jbe .L1
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/*
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* The debugger places a breakpoint here, but the tool intercepts the BREAKPOINT event.
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* If the breakpoint triggers before the other thread enters the One() function, the tool
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* squashes the breakpoint and moves the PC back to the start of Breakpoint(). The delay
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* loop waits a while, and then the breakpoint re-triggers. This repeats until the other
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* thread is at the first instruction in One(), so the breakpoint is guaranteed to trigger
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* when the other thread is at that instruction.
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*/
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.globl BreakpointLocation
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.type BreakpointLocation, @function
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BreakpointLocation:
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nop
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ret
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