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authorAndreas Jaeger <aj@suse.de>2002-08-21 07:52:27 +0000
committerAndreas Jaeger <aj@suse.de>2002-08-21 07:52:27 +0000
commit0bbade1c7a27a55b8cccf668dd750ac5d1d75921 (patch)
tree8d368d1cf57297f28f78d16368808cff4864dc4a
parentc761cdf5a082d0d22d18f2d70443da7d064e2187 (diff)
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x86-64 mcount implementation
-rw-r--r--sysdeps/x86_64/_mcount.S67
-rw-r--r--sysdeps/x86_64/machine-gmon.h39
2 files changed, 106 insertions, 0 deletions
diff --git a/sysdeps/x86_64/_mcount.S b/sysdeps/x86_64/_mcount.S
new file mode 100644
index 0000000000..c8fe441993
--- /dev/null
+++ b/sysdeps/x86_64/_mcount.S
@@ -0,0 +1,67 @@
+/* Machine-specific calling sequence for `mcount' profiling function. x86-64 version.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ Contributed by Andreas Jaeger <aj@suse.de>.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* Assembly stub to invoke _mcount(). Compiler generated code calls
+ this stub after executing a function's prologue and without saving any
+ registers. It is therefore necessary to preserve %rcx, %rdx, %rsi, %rdi,
+ %r8, %r9 as they may contain function arguments. */
+
+#include <sysdep.h>
+
+ ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount)
+ ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(_mcount), @function)
+ .align ALIGNARG(4)
+C_LABEL(_mcount)
+ /* Allocate space for 7 registers. */
+ subq $56,$rsp
+ movq $rax,($rsp)
+ movq %rcx,8($rsp)
+ movq %rdx,16($rsp)
+ movq %rsi,24($rsp)
+ movq %rdi,32($rsp)
+ movq %r8,40($rsp)
+ movq %r9,48($rsp)
+
+ /* Setup parameter for __mcount_internal. */
+ /* selfpc is the return address on the stack. */
+ movq 48(%rsp),%rsi
+ /* Get frompc via the frame pointer. */
+ movq 8(%rbp),%rdi
+#ifdef PIC
+ call C_SYMBOL_NAME(__mcount_internal)@PLT
+#else
+ call C_SYMBOL_NAME(__mcount_internal)
+#endif
+ /* Pop the saved registers. Please note that `mcount' has no
+ return value. */
+ movq ($rsp),%r9
+ movq 8($rsp),%r8
+ movq 16($rsp),%rdi
+ movq 24($rsp),%rsi
+ movq 32($rsp),%rdx
+ movq 40($rsp),%rcx
+ movq 48($rsp),%rax
+ addq $56,$rsp
+ ret
+
+ ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
+
+#undef mcount
+weak_alias(_mcount, mcount)
diff --git a/sysdeps/x86_64/machine-gmon.h b/sysdeps/x86_64/machine-gmon.h
new file mode 100644
index 0000000000..d90d13d916
--- /dev/null
+++ b/sysdeps/x86_64/machine-gmon.h
@@ -0,0 +1,39 @@
+/* x86-64-specific implementation of profiling support.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+
+/* We need a special version of the `mcount' function since for x86-64
+ so that we do not use __builtin_return_address (N) and avoid
+ clobbering of register. */
+
+
+/* We must not pollute the global namespace. */
+#define mcount_internal __mcount_internal
+
+void mcount_internal (u_long frompc, u_long selfpc);
+
+#define _MCOUNT_DECL(frompc, selfpc) \
+void mcount_internal (u_long frompc, u_long selfpc)
+
+
+/* Define MCOUNT as empty since we have the implementation in another
+ file. */
+#define MCOUNT