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[v1,34/39] docs/devel: tcg-plugins: add execlog plugin description

Message ID 20210706145817.24109-35-alex.bennee@linaro.org
State Superseded
Headers show
Series final pre-PR for 6.1 (testing and plugins) | expand

Commit Message

Alex Bennée July 6, 2021, 2:58 p.m. UTC 
From: Alexandre Iooss <erdnaxe@crans.org>


This adds description of the execlog TCG plugin with an example.

Signed-off-by: Alexandre Iooss <erdnaxe@crans.org>

Message-Id: <20210702081307.1653644-3-erdnaxe@crans.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
 docs/devel/tcg-plugins.rst | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

-- 
2.20.1
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Patch

diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst
index 0cd77c77d2..179867e9c1 100644
--- a/docs/devel/tcg-plugins.rst
+++ b/docs/devel/tcg-plugins.rst
@@ -320,3 +320,27 @@  the user to see what hardware is accessed how often. It has a number of options:
       off:0000001c, 1, 2
       off:00000020, 1, 2
       ...
+
+- contrib/plugins/execlog.c
+
+The execlog tool traces executed instructions with memory access. It can be used
+for debugging and security analysis purposes.
+Please be aware that this will generate a lot of output.
+
+The plugin takes no argument::
+
+  qemu-system-arm $(QEMU_ARGS) \
+    -plugin ./contrib/plugins/libexeclog.so -d plugin
+
+which will output an execution trace following this structure::
+
+  # vCPU, vAddr, opcode, disassembly[, load/store, memory addr, device]...
+  0, 0xa12, 0xf8012400, "movs r4, #0"
+  0, 0xa14, 0xf87f42b4, "cmp r4, r6"
+  0, 0xa16, 0xd206, "bhs #0xa26"
+  0, 0xa18, 0xfff94803, "ldr r0, [pc, #0xc]", load, 0x00010a28, RAM
+  0, 0xa1a, 0xf989f000, "bl #0xd30"
+  0, 0xd30, 0xfff9b510, "push {r4, lr}", store, 0x20003ee0, RAM, store, 0x20003ee4, RAM
+  0, 0xd32, 0xf9893014, "adds r0, #0x14"
+  0, 0xd34, 0xf9c8f000, "bl #0x10c8"
+  0, 0x10c8, 0xfff96c43, "ldr r3, [r0, #0x44]", load, 0x200000e4, RAM