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dtrace_kinst.4: Demonstrate usage of the "regs" variable

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Suggested by:	Mina Galić <freebsd@igalic.co>
Reviewed by:	christos
Differential Revision:	https://reviews.freebsd.org/D38823
This commit is contained in:
Mark Johnston 2023-02-28 11:09:26 -05:00
parent eef9f9900f
commit 092a543ec3
1 changed files with 7 additions and 7 deletions
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14
share/man/man4/dtrace_kinst.4
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@ -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