git: 092a543ec3d2 - main - dtrace_kinst.4: Demonstrate usage of the "regs" variable
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Date: Tue, 28 Feb 2023 16:10:23 UTC
The branch main has been updated by markj:
URL: https://cgit.FreeBSD.org/src/commit/?id=092a543ec3d276e48da09538ae29c736fdce4631
commit 092a543ec3d276e48da09538ae29c736fdce4631
Author: Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2023-02-28 16:09:26 +0000
Commit: Mark Johnston <markj@FreeBSD.org>
CommitDate: 2023-02-28 16:10:04 +0000
dtrace_kinst.4: Demonstrate usage of the "regs" variable
Suggested by: Mina Galić <freebsd@igalic.co>
Reviewed by: christos
Differential Revision: https://reviews.freebsd.org/D38823
---
share/man/man4/dtrace_kinst.4 | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/share/man/man4/dtrace_kinst.4 b/share/man/man4/dtrace_kinst.4
index 0987ba493e55..349cb1aab1dd 100644
--- a/share/man/man4/dtrace_kinst.4
+++ b/share/man/man4/dtrace_kinst.4
@@ -57,7 +57,7 @@ The provider is currently implemented only for amd64.
.Sh EXAMPLES
Find the offset corresponding to the third instruction in
.Fn vm_fault
-and trace it:
+and trace it, printing the contents of the RSI register:
.Bd -literal -offset indent
# kgdb
(kgdb) disas /r vm_fault
@@ -66,12 +66,12 @@ Dump of assembler code for function vm_fault:
0xffffffff80876df1 <+1>: 48 89 e5 mov %rsp,%rbp
0xffffffff80876df4 <+4>: 41 57 push %r15
-# dtrace -n 'kinst::vm_fault:4'
- 2 81500 vm_fault:4
- 2 81500 vm_fault:4
- 2 81500 vm_fault:4
- 2 81500 vm_fault:4
- 0 81500 vm_fault:4
+# dtrace -n 'kinst::vm_fault:4 {printf("%#x", regs[R_RSI]);}'
+ 2 81500 vm_fault:4 0x827c56000
+ 2 81500 vm_fault:4 0x827878000
+ 2 81500 vm_fault:4 0x1fab9bef0000
+ 2 81500 vm_fault:4 0xe16cf749000
+ 0 81500 vm_fault:4 0x13587c366000
...
.Ed
.Pp