Commit 23c7d70d authored by Jean Pihet's avatar Jean Pihet Committed by Catalin Marinas

ARM64: perf: add support for frame pointer unwinding in compat mode

When profiling a 32-bit application, user space callchain unwinding
using the frame pointer is performed in compat mode. The code is taken
over from the AARCH32 code and adapted to work on AARCH64.
Signed-off-by: default avatarJean Pihet <jean.pihet@linaro.org>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 2ee0d7fd
...@@ -1348,8 +1348,8 @@ early_initcall(init_hw_perf_events); ...@@ -1348,8 +1348,8 @@ early_initcall(init_hw_perf_events);
* Callchain handling code. * Callchain handling code.
*/ */
struct frame_tail { struct frame_tail {
struct frame_tail __user *fp; struct frame_tail __user *fp;
unsigned long lr; unsigned long lr;
} __attribute__((packed)); } __attribute__((packed));
/* /*
...@@ -1386,22 +1386,80 @@ user_backtrace(struct frame_tail __user *tail, ...@@ -1386,22 +1386,80 @@ user_backtrace(struct frame_tail __user *tail,
return buftail.fp; return buftail.fp;
} }
/*
* The registers we're interested in are at the end of the variable
* length saved register structure. The fp points at the end of this
* structure so the address of this struct is:
* (struct compat_frame_tail *)(xxx->fp)-1
*
* This code has been adapted from the ARM OProfile support.
*/
struct compat_frame_tail {
compat_uptr_t fp; /* a (struct compat_frame_tail *) in compat mode */
u32 sp;
u32 lr;
} __attribute__((packed));
static struct compat_frame_tail __user *
compat_user_backtrace(struct compat_frame_tail __user *tail,
struct perf_callchain_entry *entry)
{
struct compat_frame_tail buftail;
unsigned long err;
/* Also check accessibility of one struct frame_tail beyond */
if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
return NULL;
pagefault_disable();
err = __copy_from_user_inatomic(&buftail, tail, sizeof(buftail));
pagefault_enable();
if (err)
return NULL;
perf_callchain_store(entry, buftail.lr);
/*
* Frame pointers should strictly progress back up the stack
* (towards higher addresses).
*/
if (tail + 1 >= (struct compat_frame_tail __user *)
compat_ptr(buftail.fp))
return NULL;
return (struct compat_frame_tail __user *)compat_ptr(buftail.fp) - 1;
}
void perf_callchain_user(struct perf_callchain_entry *entry, void perf_callchain_user(struct perf_callchain_entry *entry,
struct pt_regs *regs) struct pt_regs *regs)
{ {
struct frame_tail __user *tail;
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
/* We don't support guest os callchain now */ /* We don't support guest os callchain now */
return; return;
} }
perf_callchain_store(entry, regs->pc); perf_callchain_store(entry, regs->pc);
tail = (struct frame_tail __user *)regs->regs[29];
while (entry->nr < PERF_MAX_STACK_DEPTH && if (!compat_user_mode(regs)) {
tail && !((unsigned long)tail & 0xf)) /* AARCH64 mode */
tail = user_backtrace(tail, entry); struct frame_tail __user *tail;
tail = (struct frame_tail __user *)regs->regs[29];
while (entry->nr < PERF_MAX_STACK_DEPTH &&
tail && !((unsigned long)tail & 0xf))
tail = user_backtrace(tail, entry);
} else {
/* AARCH32 compat mode */
struct compat_frame_tail __user *tail;
tail = (struct compat_frame_tail __user *)regs->compat_fp - 1;
while ((entry->nr < PERF_MAX_STACK_DEPTH) &&
tail && !((unsigned long)tail & 0x3))
tail = compat_user_backtrace(tail, entry);
}
} }
/* /*
...@@ -1429,6 +1487,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry, ...@@ -1429,6 +1487,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
frame.fp = regs->regs[29]; frame.fp = regs->regs[29];
frame.sp = regs->sp; frame.sp = regs->sp;
frame.pc = regs->pc; frame.pc = regs->pc;
walk_stackframe(&frame, callchain_trace, entry); walk_stackframe(&frame, callchain_trace, entry);
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment