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Add ARM callchain support for hwpmc.

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Sponsored by: NETASQ
MFC after:	3 days
This commit is contained in:
Fabien Thomas 2012-06-13 06:38:25 +00:00
parent 46f5390139
commit 790fb4edf2
2 changed files with 103 additions and 15 deletions
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14
sys/arm/include/pmc_mdep.h
View File

@ -50,9 +50,17 @@ union pmc_md_pmc {
struct pmc_md_xscale_pmc pm_xscale;
};
#define PMC_TRAPFRAME_TO_PC(TF) ((TF)->tf_pc)
#define PMC_TRAPFRAME_TO_FP(TF) ((TF)->tf_usr_lr)
#define PMC_TRAPFRAME_TO_SP(TF) ((TF)->tf_usr_sp)
#define PMC_IN_KERNEL_STACK(S,START,END) \
((S) >= (START) && (S) < (END))
#define PMC_IN_KERNEL(va) (((va) >= USRSTACK) && \
((va) < VM_MAX_KERNEL_ADDRESS))
#define PMC_IN_USERSPACE(va) ((va) <= VM_MAXUSER_ADDRESS)
#define PMC_TRAPFRAME_TO_PC(TF) ((TF)->tf_pc)
#define PMC_TRAPFRAME_TO_FP(TF) ((TF)->tf_r11)
#define PMC_TRAPFRAME_TO_SVC_SP(TF) ((TF)->tf_svc_sp)
#define PMC_TRAPFRAME_TO_USR_SP(TF) ((TF)->tf_usr_sp)
/* Build a fake kernel trapframe from current instruction pointer. */
#define PMC_FAKE_TRAPFRAME(TF) \

104
sys/dev/hwpmc/hwpmc_arm.c
View File

@ -30,10 +30,16 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/pmc.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <machine/pmc_mdep.h>
#include <machine/cpu.h>
#include <machine/md_var.h>
#include <machine/pmc_mdep.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
struct pmc_mdep *
pmc_md_initialize()
@ -58,27 +64,101 @@ pmc_md_finalize(struct pmc_mdep *md)
#endif
}
static int
pmc_save_callchain(uintptr_t *cc, int maxsamples,
struct trapframe *tf)
{
*cc = PMC_TRAPFRAME_TO_PC(tf);
return (1);
}
int
pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
struct trapframe *tf)
{
uintptr_t pc, r, stackstart, stackend, fp;
struct thread *td;
int count;
return pmc_save_callchain(cc, maxsamples, tf);
KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
__LINE__));
pc = PMC_TRAPFRAME_TO_PC(tf);
*cc++ = pc;
if ((td = curthread) == NULL)
return (1);
if (maxsamples <= 1)
return (1);
stackstart = (uintptr_t) td->td_kstack;
stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
fp = PMC_TRAPFRAME_TO_FP(tf);
if (!PMC_IN_KERNEL(pc) ||
!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
return (1);
for (count = 1; count < maxsamples; count++) {
/* Use saved lr as pc. */
r = fp - sizeof(uintptr_t);
if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
break;
pc = *(uintptr_t *)r;
if (!PMC_IN_KERNEL(pc))
break;
*cc++ = pc;
/* Switch to next frame up */
r = fp - 3 * sizeof(uintptr_t);
if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
break;
fp = *(uintptr_t *)r;
if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
break;
}
return (count);
}
int
pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
struct trapframe *tf)
{
uintptr_t pc, r, oldfp, fp;
struct thread *td;
int count;
return pmc_save_callchain(cc, maxsamples, tf);
KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
__LINE__, (void *) tf));
pc = PMC_TRAPFRAME_TO_PC(tf);
*cc++ = pc;
if ((td = curthread) == NULL)
return (1);
if (maxsamples <= 1)
return (1);
oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
if (!PMC_IN_USERSPACE(pc) ||
!PMC_IN_USERSPACE(fp))
return (1);
for (count = 1; count < maxsamples; count++) {
/* Use saved lr as pc. */
r = fp - sizeof(uintptr_t);
if (copyin((void *)r, &pc, sizeof(pc)) != 0)
break;
if (!PMC_IN_USERSPACE(pc))
break;
*cc++ = pc;
/* Switch to next frame up */
oldfp = fp;
r = fp - 3 * sizeof(uintptr_t);
if (copyin((void *)r, &fp, sizeof(fp)) != 0)
break;
if (fp < oldfp || !PMC_IN_USERSPACE(fp))
break;
}
return (count);
}