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Re: [PATCH] i386: Add some naked attribute tests


On Tue, Aug 1, 2017 at 1:49 PM, Uros Bizjak <ubizjak@gmail.com> wrote:
> On Tue, Aug 1, 2017 at 9:46 PM, H.J. Lu <hongjiu.lu@intel.com> wrote:
>> Add some tests for implementing interrupt handlers with naked attribute.
>>
>> OK for trunk?
>>
>> H.J.
>> ---
>>         * gcc.dg/guality/pr25967-1.c: New test.
>>         * gcc.dg/guality/pr25967-2.c: Likewise.
>>         * gcc.dg/torture/pr25967-1.c: Likewise.
>>         * gcc.dg/torture/pr25967-2.c: Likewise.
>
> OK with a small change below.
>

>> +void
>> +fn (void)
>> +{
>> +  struct interrupt_frame *frame;
>> +  uword_t error;
>> +  asm ("lea " WORD_SIZE "(%%" STACK_POINTER "), %0" : "=r" (frame) : );
>> +  asm ("mov (%%" STACK_POINTER "), %0" : "=r" (error) : );
>
> The above two asm needs to be volatile. They are not "simple" asm, and
> access stack pointer behind the compilers back. And please merge them
> to one multi-line volatile asm statement.
>


This is what I am checking in.

Thanks.


-- 
H.J.
From de294f8dd290c9c8c458ffcb4755a1aff99e336a Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Tue, 1 Aug 2017 12:42:12 -0700
Subject: [PATCH] i386: Add some naked attribute tests

Add some tests for implementing interrupt handlers with naked attribute.

	* gcc.dg/guality/pr25967-1.c: New test.
	* gcc.dg/guality/pr25967-2.c: Likewise.
	* gcc.dg/torture/pr25967-1.c: Likewise.
	* gcc.dg/torture/pr25967-2.c: Likewise.
---
 gcc/testsuite/gcc.dg/guality/pr25967-1.c | 80 ++++++++++++++++++++++++++++++++
 gcc/testsuite/gcc.dg/guality/pr25967-2.c | 72 ++++++++++++++++++++++++++++
 gcc/testsuite/gcc.dg/torture/pr25967-1.c | 73 +++++++++++++++++++++++++++++
 gcc/testsuite/gcc.dg/torture/pr25967-2.c | 66 ++++++++++++++++++++++++++
 4 files changed, 291 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/guality/pr25967-1.c
 create mode 100644 gcc/testsuite/gcc.dg/guality/pr25967-2.c
 create mode 100644 gcc/testsuite/gcc.dg/torture/pr25967-1.c
 create mode 100644 gcc/testsuite/gcc.dg/torture/pr25967-2.c

diff --git a/gcc/testsuite/gcc.dg/guality/pr25967-1.c b/gcc/testsuite/gcc.dg/guality/pr25967-1.c
new file mode 100644
index 00000000000..01d97fe612e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/guality/pr25967-1.c
@@ -0,0 +1,80 @@
+/* { dg-do run { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-g -mgeneral-regs-only" } */
+
+extern void exit (int);
+
+typedef unsigned int uword_t __attribute__ ((mode (__word__)));
+
+#define ERROR		0x12345670
+#define IP		0x12345671
+#define CS		0x12345672
+#define FLAGS		0x12345673
+#define SP		0x12345674
+#define SS		0x12345675
+
+#ifdef __x86_64__
+# define STACK_POINTER	"rsp"
+# define WORD_SIZE	"8"
+#else
+# define STACK_POINTER	"esp"
+# define WORD_SIZE	"4"
+#endif
+
+#define STRING(x)	XSTRING(x)
+#define XSTRING(x)	#x
+#define ASMNAME(cname)  ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define ASMNAME2(prefix, cname) XSTRING (prefix) cname
+
+struct interrupt_frame
+{
+  uword_t ip;
+  uword_t cs;
+  uword_t flags;
+  uword_t sp;
+  uword_t ss;
+};
+
+__attribute__((naked, used))
+void
+fn (void)
+{
+  struct interrupt_frame *frame;
+  uword_t error;
+  asm volatile ("lea " WORD_SIZE "(%%" STACK_POINTER "), %0\n\t"
+		"mov (%%" STACK_POINTER "), %1" 
+		: "=r" (frame), "=r" (error) :); 
+  if (ERROR != error)		/* BREAK */
+    __builtin_abort ();
+  if (IP != frame->ip)
+    __builtin_abort ();
+  if (CS != frame->cs)
+    __builtin_abort ();
+  if (FLAGS != frame->flags)
+    __builtin_abort ();
+  if (SP != frame->sp)
+    __builtin_abort ();
+  if (SS != frame->ss)
+    __builtin_abort ();
+
+  exit (0);
+}
+
+int
+main ()
+{
+  asm ("push	$" STRING (SS) ";		\
+	push	$" STRING (SP) ";		\
+	push	$" STRING (FLAGS) ";		\
+	push	$" STRING (CS) ";		\
+	push	$" STRING (IP) ";		\
+	push	$" STRING (ERROR) ";		\
+	jmp	 " ASMNAME ("fn"));
+  return 0;
+}
+
+/* { dg-final { gdb-test 46 "error" "0x12345670" } } */
+/* { dg-final { gdb-test 46 "frame->ip" "0x12345671" } } */
+/* { dg-final { gdb-test 46 "frame->cs" "0x12345672" } } */
+/* { dg-final { gdb-test 46 "frame->flags" "0x12345673" } } */
+/* { dg-final { gdb-test 46 "frame->sp" "0x12345674" } } */
+/* { dg-final { gdb-test 46 "frame->ss" "0x12345675" } } */
diff --git a/gcc/testsuite/gcc.dg/guality/pr25967-2.c b/gcc/testsuite/gcc.dg/guality/pr25967-2.c
new file mode 100644
index 00000000000..a8bdf9f546d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/guality/pr25967-2.c
@@ -0,0 +1,72 @@
+/* { dg-do run { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-g -mgeneral-regs-only" } */
+
+extern void exit (int);
+
+typedef unsigned int uword_t __attribute__ ((mode (__word__)));
+
+#define IP		0x12345671
+#define CS		0x12345672
+#define FLAGS		0x12345673
+#define SP		0x12345674
+#define SS		0x12345675
+
+#ifdef __x86_64__
+# define STACK_POINTER	"rsp"
+# define WORD_SIZE	"8"
+#else
+# define STACK_POINTER	"esp"
+# define WORD_SIZE	"4"
+#endif
+
+#define STRING(x)	XSTRING(x)
+#define XSTRING(x)	#x
+#define ASMNAME(cname)  ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define ASMNAME2(prefix, cname) XSTRING (prefix) cname
+
+struct interrupt_frame
+{
+  uword_t ip;
+  uword_t cs;
+  uword_t flags;
+  uword_t sp;
+  uword_t ss;
+};
+
+__attribute__((naked, used))
+void
+fn (void)
+{
+  struct interrupt_frame *frame;
+  asm volatile ("lea (%%" STACK_POINTER "), %0" : "=r" (frame) : ); 
+  if (IP != frame->ip)		/* BREAK */
+    __builtin_abort ();
+  if (CS != frame->cs)
+    __builtin_abort ();
+  if (FLAGS != frame->flags)
+    __builtin_abort ();
+  if (SP != frame->sp)
+    __builtin_abort ();
+  if (SS != frame->ss)
+    __builtin_abort ();
+
+  exit (0);
+}
+
+int
+main ()
+{
+  asm ("push	$" STRING (SS) ";		\
+	push	$" STRING (SP) ";		\
+	push	$" STRING (FLAGS) ";		\
+	push	$" STRING (CS) ";		\
+	push	$" STRING (IP) ";		\
+	jmp	 " ASMNAME ("fn"));
+  return 0;
+}
+
+/* { dg-final { gdb-test 42 "frame->ip" "0x12345671" } } */
+/* { dg-final { gdb-test 42 "frame->cs" "0x12345672" } } */
+/* { dg-final { gdb-test 42 "frame->flags" "0x12345673" } } */
+/* { dg-final { gdb-test 42 "frame->sp" "0x12345674" } } */
+/* { dg-final { gdb-test 42 "frame->ss" "0x12345675" } } */
diff --git a/gcc/testsuite/gcc.dg/torture/pr25967-1.c b/gcc/testsuite/gcc.dg/torture/pr25967-1.c
new file mode 100644
index 00000000000..c504363030d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr25967-1.c
@@ -0,0 +1,73 @@
+/* { dg-do run { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-mgeneral-regs-only" } */
+
+extern void exit (int);
+
+typedef unsigned int uword_t __attribute__ ((mode (__word__)));
+
+#define ERROR		0x12345670
+#define IP		0x12345671
+#define CS		0x12345672
+#define FLAGS		0x12345673
+#define SP		0x12345674
+#define SS		0x12345675
+
+#ifdef __x86_64__
+# define STACK_POINTER	"rsp"
+# define WORD_SIZE	"8"
+#else
+# define STACK_POINTER	"esp"
+# define WORD_SIZE	"4"
+#endif
+
+#define STRING(x)	XSTRING(x)
+#define XSTRING(x)	#x
+#define ASMNAME(cname)  ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define ASMNAME2(prefix, cname) XSTRING (prefix) cname
+
+struct interrupt_frame
+{
+  uword_t ip;
+  uword_t cs;
+  uword_t flags;
+  uword_t sp;
+  uword_t ss;
+};
+
+__attribute__((naked, used))
+void
+fn (void)
+{
+  struct interrupt_frame *frame;
+  uword_t error;
+  asm volatile ("lea " WORD_SIZE "(%%" STACK_POINTER "), %0\n\t"
+		"mov (%%" STACK_POINTER "), %1" 
+		: "=r" (frame), "=r" (error) :); 
+  if (ERROR != error)
+    __builtin_abort ();
+  if (IP != frame->ip)
+    __builtin_abort ();
+  if (CS != frame->cs)
+    __builtin_abort ();
+  if (FLAGS != frame->flags)
+    __builtin_abort ();
+  if (SP != frame->sp)
+    __builtin_abort ();
+  if (SS != frame->ss)
+    __builtin_abort ();
+
+  exit (0);
+}
+
+int
+main ()
+{
+  asm ("push	$" STRING (SS) ";		\
+	push	$" STRING (SP) ";		\
+	push	$" STRING (FLAGS) ";		\
+	push	$" STRING (CS) ";		\
+	push	$" STRING (IP) ";		\
+	push	$" STRING (ERROR) ";		\
+	jmp	 " ASMNAME ("fn"));
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/torture/pr25967-2.c b/gcc/testsuite/gcc.dg/torture/pr25967-2.c
new file mode 100644
index 00000000000..3e27dd51aa2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr25967-2.c
@@ -0,0 +1,66 @@
+/* { dg-do run { target i?86-*-* x86_64-*-* } } */
+/* { dg-options "-mgeneral-regs-only" } */
+
+extern void exit (int);
+
+typedef unsigned int uword_t __attribute__ ((mode (__word__)));
+
+#define IP		0x12345671
+#define CS		0x12345672
+#define FLAGS		0x12345673
+#define SP		0x12345674
+#define SS		0x12345675
+
+#ifdef __x86_64__
+# define STACK_POINTER	"rsp"
+# define WORD_SIZE	"8"
+#else
+# define STACK_POINTER	"esp"
+# define WORD_SIZE	"4"
+#endif
+
+#define STRING(x)	XSTRING(x)
+#define XSTRING(x)	#x
+#define ASMNAME(cname)  ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define ASMNAME2(prefix, cname) XSTRING (prefix) cname
+
+struct interrupt_frame
+{
+  uword_t ip;
+  uword_t cs;
+  uword_t flags;
+  uword_t sp;
+  uword_t ss;
+};
+
+__attribute__((naked, used))
+void
+fn (void)
+{
+  struct interrupt_frame *frame;
+  asm volatile ("lea (%%" STACK_POINTER "), %0" : "=r" (frame) : ); 
+  if (IP != frame->ip)
+    __builtin_abort ();
+  if (CS != frame->cs)
+    __builtin_abort ();
+  if (FLAGS != frame->flags)
+    __builtin_abort ();
+  if (SP != frame->sp)
+    __builtin_abort ();
+  if (SS != frame->ss)
+    __builtin_abort ();
+
+  exit (0);
+}
+
+int
+main ()
+{
+  asm ("push	$" STRING (SS) ";		\
+	push	$" STRING (SP) ";		\
+	push	$" STRING (FLAGS) ";		\
+	push	$" STRING (CS) ";		\
+	push	$" STRING (IP) ";		\
+	jmp	 " ASMNAME ("fn"));
+  return 0;
+}
-- 
2.13.3


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