From 5ee924c2fb39b7702b9ed586df9b613ca7401ea3 Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@acm.org>
Date: Tue, 18 Jun 2002 21:18:46 +0000
Subject: [PATCH] xtensa.h (FUNCTION_PROFILER): Respect flag_pic when
generating the call to _mcount.
* config/xtensa/xtensa.h (FUNCTION_PROFILER): Respect flag_pic
when generating the call to _mcount.
(NO_PROFILE_COUNTERS): Define.
From-SVN: r54765
---
gcc/ChangeLog | 6 ++++++
gcc/config/xtensa/xtensa.h | 44 +++++++++++++++++++++-----------------
2 files changed, 30 insertions(+), 20 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 37bb4873597e..db446af5f7e0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2002-06-18 Bob Wilson <bob.wilson@acm.org>
+
+ * config/xtensa/xtensa.h (FUNCTION_PROFILER): Respect flag_pic
+ when generating the call to _mcount.
+ (NO_PROFILE_COUNTERS): Define.
+
2002-06-18 Richard Henderson <rth@redhat.com>
* print-rtl.c (print_rtx): Adjust NOTE argument numbers for
diff --git a/gcc/config/xtensa/xtensa.h b/gcc/config/xtensa/xtensa.h
index 3ec7b3f8e660..e98c2c673f8e 100644
--- a/gcc/config/xtensa/xtensa.h
+++ b/gcc/config/xtensa/xtensa.h
@@ -921,29 +921,33 @@ typedef struct xtensa_args {
&& (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
|| TREE_ADDRESSABLE (TYPE)))
-/* Output assembler code to FILE to increment profiler label LABELNO
- for profiling a function entry.
-
- The mcount code in glibc doesn't seem to use this LABELNO stuff.
- Some ports (e.g., MIPS) don't even bother to pass the label
- address, and even those that do (e.g., i386) don't seem to use it.
- The information needed by mcount() is the current PC and the
- current return address, so that mcount can identify an arc in the
- call graph. For Xtensa, we pass the current return address as
- the first argument to mcount, and the current PC is available as
- a0 in mcount's register window. Both of these values contain
- window size information in the two most significant bits; we assume
- that the mcount code will mask off those bits. The call to mcount
- uses a window size of 8 to make sure that mcount doesn't clobber
+/* Profiling Xtensa code is typically done with the built-in profiling
+ feature of Tensilica's instruction set simulator, which does not
+ require any compiler support. Profiling code on a real (i.e.,
+ non-simulated) Xtensa processor is currently only supported by
+ GNU/Linux with glibc. The glibc version of _mcount doesn't require
+ counter variables. The _mcount function needs the current PC and
+ the current return address to identify an arc in the call graph.
+ Pass the current return address as the first argument; the current
+ PC is available as a0 in _mcount's register window. Both of these
+ values contain window size information in the two most significant
+ bits; we assume that _mcount will mask off those bits. The call to
+ _mcount uses a window size of 8 to make sure that it doesn't clobber
any incoming argument values. */
-#define FUNCTION_PROFILER(FILE, LABELNO) \
+#define NO_PROFILE_COUNTERS
+
+#define FUNCTION_PROFILER(FILE, LABELNO) \
do { \
- fprintf (FILE, "\taddi\t%s, %s, 0\t# save current return address\n", \
- reg_names[GP_REG_FIRST+10], \
- reg_names[GP_REG_FIRST+0]); \
- fprintf (FILE, "\tcall8\t_mcount\n"); \
- } while (0);
+ fprintf (FILE, "\t%s\ta10, a0\n", TARGET_DENSITY ? "mov.n" : "mov"); \
+ if (flag_pic) \
+ { \
+ fprintf (FILE, "\tmovi\ta8, _mcount@PLT\n"); \
+ fprintf (FILE, "\tcallx8\ta8\n"); \
+ } \
+ else \
+ fprintf (FILE, "\tcall8\t_mcount\n"); \
+ } while (0)
/* Stack pointer value doesn't matter at exit. */
#define EXIT_IGNORE_STACK 1
--
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