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dtrace: implement riscv dtrace_getustackdepth()

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Pretty trivial following other implementations. The existing
dtrace_getustack_common() does most of the work.

Reviewed by:	markj
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D38303
This commit is contained in:
Mitchell Horne 2023-02-06 14:23:42 -04:00
parent 3872010732
commit c6943b44f7
1 changed files with 27 additions and 4 deletions
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31
sys/cddl/dev/dtrace/riscv/dtrace_isa.c
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@ -169,7 +169,7 @@ dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
{
volatile uint16_t *flags;
struct trapframe *tf;
uintptr_t pc, sp, fp;
uintptr_t pc, fp;
proc_t *p;
int n;
@ -195,7 +195,6 @@ dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
return;
pc = tf->tf_sepc;
sp = tf->tf_sp;
fp = tf->tf_s[0];
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
@ -207,7 +206,6 @@ dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
* at the current stack pointer address since the call
* instruction puts it there right before the branch.
*/
*pcstack++ = (uint64_t)pc;
pcstack_limit--;
if (pcstack_limit <= 0)
@ -231,8 +229,33 @@ dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit)
int
dtrace_getustackdepth(void)
{
struct trapframe *tf;
uintptr_t pc, fp;
int n = 0;
printf("IMPLEMENT ME: %s\n", __func__);
if (curproc == NULL || (tf = curthread->td_frame) == NULL)
return (0);
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_FAULT))
return (-1);
pc = tf->tf_sepc;
fp = tf->tf_s[0];
if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
/*
* In an entry probe. The frame pointer has not yet been
* pushed (that happens in the function prologue). The
* best approach is to add the current pc as a missing top
* of stack and back the pc up to the caller, which is stored
* at the current stack pointer address since the call
* instruction puts it there right before the branch.
*/
pc = tf->tf_ra;
n++;
}
n += dtrace_getustack_common(NULL, 0, pc, fp);
return (0);
}