Trace Format¶

• Table of contents
• Trace Format
  • Instruction record
  • Memory access record
  • Register write record

QEMU4V is able to generate traces of program execution. Here is the description of the trace format.
The QEMU4V trace contains records of the following kinds: instruction records, memory access records, register write records.

Instruction record¶

Appears in the trace when the corresponding instruction from the target program has been executed.
The record format is as follows:

<time> <scale> <cpu> [IT|IS] (<inst_id>) <addr> <opcode> [A|T|X] <mode>_<security> : <disasm>

The record fields are described in the following table:

Field	Description	Value
<time>	Timestamp	Decimal integer value
<scale>	Timestamp unit	String (the clk value means, that the timestamp field shows not physical time but the inex of executed instruction)
<cpu>	Identifier for the processor at which the instruction is executed	Decimal integer value
[IT|IS]	Instruction execution flag	IT when "Instruction Taken", IS when "Instruction Skipped"
<inst_id>	Index of the executed instruction	Decimal integer value
<addr>	Virtual memory address for the instruction	Hexadecimal value
<opcode>	16\32\64-bit code for the instruction	Hexadecimal value
[A|T|X]	Instruction set identifier	TODO
<mode>	Execution mode	String (one of the following: svc, irq, fiq, usr, mon, sys, abt, und)
<security>	Flag for the processor security mode	s when "secure", ns when "non-secure"
<disasm>	Disassembly representation for the instruction	String

Example:

1 clk 0 IT (1) 00000004 3c080001 A svc : lui t0,0x1

Memory access record¶

TODO

Register write record¶

TODO