diff options
| author | Mark Johnston <markj@FreeBSD.org> | 2022-08-09 20:08:13 +0000 |
|---|---|---|
| committer | Mark Johnston <markj@FreeBSD.org> | 2022-08-09 22:34:01 +0000 |
| commit | 3ba8e9dc4a0e0e9c35cfadfe25379871ce581697 (patch) | |
| tree | 293bc80524525f0b031e96527e0c92f31d580f44 /sys/cddl/contrib/opensolaris/uts/common | |
| parent | a7aa3d4d758dc60894e7f9c99411a64837fd3c18 (diff) | |
| download | src-3ba8e9dc4a0e0e9c35cfadfe25379871ce581697.tar.gz src-3ba8e9dc4a0e0e9c35cfadfe25379871ce581697.zip | |
dtrace/amd64: Implement emulation of call instructions
Here, the provider is responsible for updating the trapframe to redirect
control flow and for computing the return address. Once software-saved
registers are restored, the emulation shifts the remaining context down
on the stack to make space for the return address, then copies the
address provided by the invop handler. dtrace_invop() is modified to
allocate temporary storage space on the stack for use by the provider to
return the return address.
This is to support a new provider for amd64 which can instrument
arbitrary instructions, not just function entry and exit instructions as
FBT does.
In collaboration with: christos
Sponsored by: Google, Inc. (GSoC 2022)
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common')
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h index c15cc39189b1..5cad5a3b18c9 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h +++ b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h @@ -2440,6 +2440,10 @@ extern void dtrace_helpers_destroy(proc_t *); #define DTRACE_INVOP_NOP 4 #define DTRACE_INVOP_RET 5 +#if defined(__amd64) +#define DTRACE_INVOP_CALL 6 +#endif + #elif defined(__powerpc__) #define DTRACE_INVOP_BCTR 1 |