amd/agesa/*/gcc-intrin.h: Invaild inline asm

The 'm' (a memory reference) constraint makes little sense here since we
are talking about a fs relative read, rather 'ir' (immediate or
register) constraint is more sensible.

N.B. The 'p' constraint allows anything which fits the form of an address
calculation where the 'ir' constraint is just a register /xor/
immediate. Hence would produce better code here however, unfortunately,
clang does not currently support it properly.

The %b and %w constraints are also redundant and only hide errors.

The functions writefsword() and writefsdword() should use ir instead of
iq. iq is unnecessarily restrictive (it is only required for writing
bytes).

The cld in stosb is redundant (and the constraints are unnecessarily
complicated). Note that The ABI guarantees that the direction flag is
cleared. i.e. eax, ecx, edx are caller-saved, returned value in eax,
eax+edx, st0, yaddayadda, direction flag cleared. In fact bad things can
happen if you set it in some asm and do not clear it until the end of
the asm.

Line wrap these extraneously long lines found with these particular functions.

Many thanks to Christoph Mallon <christoph.mallon@gmx.de> from #llvm for
helping me with this.

Change-Id: Iaf3ad65791640e1060a2029e7ebb043f57b338a9
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5758
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>

1 files changed, 102 insertions, 87 deletions

diff --git a/src/vendorcode/amd/agesa/f14/Include/gcc-intrin.h b/src/vendorcode/amd/agesa/f14/Include/gcc-intrin.h
index 5730a1a..7d90f8b 100644
--- a/src/vendorcode/amd/agesa/f14/Include/gcc-intrin.h
+++ b/src/vendorcode/amd/agesa/f14/Include/gcc-intrin.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2011, Advanced Micro Devices, Inc.
- * All rights reserved.
+ * Copyright (c) 2011, Advanced Micro Devices, Inc. All rights reserved.
+ * Copyright (c) 2014, Edward O'Callaghan <eocallaghan@alterapraxis.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -34,9 +34,9 @@ static __inline__ __attribute__((always_inline)) unsigned char __inbyte(unsigned
   unsigned char value;
 
   __asm__ __volatile__ (
-    "in  %%dx, %%al"
+    "in  %1, %0"
     : "=a" (value)
-    : "d" (Port)
+    : "Nd" (Port)
     );
 
   return value;
@@ -47,9 +47,9 @@ static __inline__ __attribute__((always_inline)) unsigned short __inword(unsigne
   unsigned short value;
 
   __asm__ __volatile__ (
-    "in  %%dx, %%ax"
+    "in  %1, %0"
     : "=a" (value)
-    : "d" (Port)
+    : "Nd" (Port)
     );
 
   return value;
@@ -60,9 +60,9 @@ static __inline__ __attribute__((always_inline)) unsigned long __indword(unsigne
   unsigned long value;
 
   __asm__ __volatile__ (
-    "in  %%dx, %%eax"
+    "in  %1, %0"
     : "=a" (value)
-    : "d" (Port)
+    : "Nd" (Port)
     );
   return value;
 
@@ -71,81 +71,81 @@ static __inline__ __attribute__((always_inline)) unsigned long __indword(unsigne
 static __inline__ __attribute__((always_inline)) void __outbyte(unsigned short Port,unsigned char Data)
 {
   __asm__ __volatile__ (
-    "out  %%al, %%dx"
+    "out  %0, %1"
     :
-    : "a" (Data), "d" (Port)
+    : "a" (Data), "Nd" (Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __outword(unsigned short Port,unsigned short Data)
 {
   __asm__ __volatile__ (
-    "out  %%ax, %%dx"
+    "out  %0, %1"
     :
-    : "a" (Data), "d" (Port)
+    : "a" (Data), "Nd" (Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __outdword(unsigned short Port,unsigned long Data)
 {
   __asm__ __volatile__ (
-    "out  %%eax, %%dx"
+    "out  %0, %1"
     :
-    : "a" (Data), "d" (Port)
+    : "a" (Data), "Nd" (Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __inbytestring(unsigned short Port,unsigned char *Buffer,unsigned long Count)
 {
   __asm__ __volatile__ (
-    "cld ; rep ; insb "
-    : "=D" (Buffer), "=c" (Count)
-    : "d"(Port), "0"(Buffer), "1" (Count)
+    "rep ; insb"
+    : "+D" (Buffer), "+c" (Count)
+    : "d"(Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __inwordstring(unsigned short Port,unsigned short *Buffer,unsigned long Count)
 {
   __asm__ __volatile__ (
-    "cld ; rep ; insw "
-    : "=D" (Buffer), "=c" (Count)
-    : "d"(Port), "0"(Buffer), "1" (Count)
+    "rep ; insw"
+    : "+D" (Buffer), "+c" (Count)
+    : "d"(Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __indwordstring(unsigned short Port,unsigned long *Buffer,unsigned long Count)
 {
   __asm__ __volatile__ (
-    "cld ; rep ; insl "
-    : "=D" (Buffer), "=c" (Count)
-    : "d"(Port), "0"(Buffer), "1" (Count)
+    "rep ; insl"
+    : "+D" (Buffer), "+c" (Count)
+    : "d"(Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __outbytestring(unsigned short Port,unsigned char *Buffer,unsigned long Count)
 {
   __asm__ __volatile__ (
-    "cld ; rep ; outsb "
-    : "=S" (Buffer), "=c" (Count)
-    : "d"(Port), "0"(Buffer), "1" (Count)
+    "rep ; outsb"
+    : "+S" (Buffer), "+c" (Count)
+    : "d"(Port)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __outwordstring(unsigned short Port,unsigned short *Buffer,unsigned long Count)
 {
   __asm__ __volatile__ (
-    "cld ; rep ; outsw "
-    : "=S" (Buffer), "=c" (Count)
-    : "d"(Port), "0"(Buffer), "1" (Count)
+    "rep ; outsw"
+    : "+S" (Buffer), "+c" (Count)
+    : "d"(Port)
   );
 }
 
 static __inline__ __attribute__((always_inline)) void __outdwordstring(unsigned short Port,unsigned long *Buffer,unsigned long Count)
 {
   __asm__ __volatile__ (
-   "cld ; rep ; outsl "
-   : "=S" (Buffer), "=c" (Count)
-   : "d"(Port), "0"(Buffer), "1" (Count)
+   "rep ; outsl"
+   : "+S" (Buffer), "+c" (Count)
+   : "d"(Port)
    );
 }
 
@@ -154,7 +154,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readdr0(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%dr0, %[value]"
-    : [value] "=a" (value)
+    : [value] "=r" (value)
     );
   return value;
 }
@@ -164,7 +164,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readdr1(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%dr1, %[value]"
-    : [value] "=a" (value)
+    : [value] "=r" (value)
     );
   return value;
 }
@@ -174,7 +174,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readdr2(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%dr2, %[value]"
-    : [value] "=a" (value)
+    : [value] "=r" (value)
     );
   return value;
 }
@@ -184,7 +184,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readdr3(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%dr3, %[value]"
-    : [value] "=a" (value)
+    : [value] "=r" (value)
     );
   return value;
 }
@@ -194,7 +194,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readdr7(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%dr7, %[value]"
-    : [value] "=a" (value)
+    : [value] "=r" (value)
     );
   return value;
 }
@@ -230,45 +230,45 @@ static __inline__ __attribute__((always_inline)) unsigned long __readdr(unsigned
 static __inline__ __attribute__((always_inline)) void __writedr0(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%dr0"
+    "mov %0, %%dr0"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writedr1(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%dr1"
+    "mov %0, %%dr1"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writedr2(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%dr2"
+    "mov %0, %%dr2"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writedr3(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%dr3"
+    "mov %0, %%dr3"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writedr7(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%dr7"
+    "mov %0, %%dr7"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
@@ -305,9 +305,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readcr0(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%cr0, %[value]"
-    : [value] "=a" (value)
-    :
-    : "memory");
+    : [value] "=r" (value));
   return value;
 }
 
@@ -316,7 +314,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readcr2(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%cr2, %[value]"
-    : [value] "=a" (value));
+    : [value] "=r" (value));
   return value;
 }
 
@@ -325,7 +323,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readcr3(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%cr3, %[value]"
-    : [value] "=a" (value));
+    : [value] "=r" (value));
   return value;
 }
 
@@ -334,7 +332,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readcr4(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%cr4, %[value]"
-    : [value] "=a" (value));
+    : [value] "=r" (value));
   return value;
 }
 
@@ -343,7 +341,7 @@ static __inline__ __attribute__((always_inline)) unsigned long __readcr8(void)
   unsigned long value;
   __asm__ __volatile__ (
     "mov %%cr8, %[value]"
-    : [value] "=a" (value));
+    : [value] "=r" (value));
   return value;
 }
 
@@ -378,9 +376,9 @@ static __inline__ __attribute__((always_inline)) unsigned long __readcr(unsigned
 static __inline__ __attribute__((always_inline)) void __writecr0(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%cr0"
+    "mov %0, %%cr0"
     :
-    : "a" (Data)
+    : "r" (Data)
     : "memory"
     );
 }
@@ -388,36 +386,36 @@ static __inline__ __attribute__((always_inline)) void __writecr0(unsigned long D
 static __inline__ __attribute__((always_inline)) void __writecr2(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%cr2"
+    "mov %0, %%cr2"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writecr3(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%cr3"
+    "mov %0, %%cr3"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writecr4(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%cr4"
+    "mov %0, %%cr4"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
 static __inline__ __attribute__((always_inline)) void __writecr8(unsigned long Data)
 {
   __asm__ __volatile__ (
-    "mov %%eax, %%cr8"
+    "mov %0, %%cr8"
     :
-    : "a" (Data)
+    : "r" (Data)
     );
 }
 
@@ -453,7 +451,7 @@ static __inline__ __attribute__((always_inline)) UINT64 __readmsr(UINT32 msr)
 {
   UINT64 retval;
   __asm__ __volatile__(
-       "rdmsr\n\t"
+       "rdmsr"
        : "=A" (retval)
        : "c" (msr)
        );
@@ -463,7 +461,7 @@ static __inline__ __attribute__((always_inline)) UINT64 __readmsr(UINT32 msr)
 static __inline__ __attribute__((always_inline)) void __writemsr (UINT32 msr, UINT64 Value)
 {
   __asm__ __volatile__ (
-     "wrmsr\n\t"
+     "wrmsr"
      :
      : "c" (msr), "A" (Value)
      );
@@ -526,39 +524,57 @@ static __inline__ __attribute__((always_inline)) void __lidt(void *Source)
   __asm__ __volatile__("lidt %0" : : "m"(*(short*)Source));
 }
 
-static __inline__ __attribute__((always_inline)) void __writefsbyte(const unsigned long Offset, const unsigned char Data)
+static __inline__ __attribute__((always_inline)) void
+__writefsbyte(const unsigned long Offset, const unsigned char Data)
 {
-  __asm__("movb %b[Data], %%fs:%a[Offset]" : : [Offset] "ir" (Offset), [Data] "iq" (Data));
+  __asm__ ("movb %[Data], %%fs:%a[Offset]"
+          :
+          : [Offset] "ir" (Offset), [Data] "iq" (Data));
 }
 
-static __inline__ __attribute__((always_inline)) void __writefsword(const unsigned long Offset, const unsigned short Data)
+static __inline__ __attribute__((always_inline)) void
+__writefsword(const unsigned long Offset, const unsigned short Data)
 {
-  __asm__("movw %w[Data], %%fs:%a[Offset]" : : [Offset] "ir" (Offset), [Data] "iq" (Data));
+  __asm__ ("movw %[Data], %%fs:%a[Offset]"
+          :
+          : [Offset] "ir" (Offset), [Data] "ir" (Data));
 }
 
-static __inline__ __attribute__((always_inline)) void __writefsdword(const unsigned long Offset, const unsigned long Data)
+static __inline__ __attribute__((always_inline)) void
+__writefsdword(const unsigned long Offset, const unsigned long Data)
 {
-  __asm__("movl %k[Data], %%fs:%a[Offset]" : : [Offset] "ir" (Offset), [Data] "iq" (Data));
+  __asm__ ("movl %[Data], %%fs:%a[Offset]"
+           :
+           : [Offset] "ir" (Offset), [Data] "ir" (Data));
 }
 
-static __inline__ __attribute__((always_inline)) unsigned char __readfsbyte(const unsigned long Offset)
+static __inline__ __attribute__((always_inline)) unsigned char
+__readfsbyte(const unsigned long Offset)
 {
   unsigned char value;
-  __asm__("movb %%fs:%a[Offset], %b[value]" : [value] "=q" (value) : [Offset] "irm" (Offset));
+  __asm__ ("movb %%fs:%a[Offset], %[value]"
+          : [value] "=q" (value)
+          : [Offset] "ir" (Offset));
   return value;
 }
 
-static __inline__ __attribute__((always_inline)) unsigned short __readfsword(const unsigned long Offset)
+static __inline__ __attribute__((always_inline)) unsigned short
+__readfsword(const unsigned long Offset)
 {
   unsigned short value;
-  __asm__("movw %%fs:%a[Offset], %w[value]" : [value] "=q" (value) : [Offset] "irm" (Offset));
+  __asm__ ("movw %%fs:%a[Offset], %[value]"
+           : [value] "=q" (value)
+           : [Offset] "ir" (Offset));
   return value;
 }
 
-static __inline__ __attribute__((always_inline)) unsigned long long __readfsdword(unsigned long long Offset)
+static __inline__ __attribute__((always_inline)) unsigned long
+__readfsdword(unsigned long Offset)
 {
-  unsigned long long value;
-  __asm__("movl %%fs:%a[Offset], %k[value]" : [value] "=q" (value) : [Offset] "irm" (Offset));
+  unsigned long value;
+  __asm__ ("movl %%fs:%a[Offset], %[value]"
+           : [value] "=r" (value)
+           : [Offset] "ir" (Offset));
   return value;
 }
 
@@ -594,23 +610,22 @@ static __inline __attribute__(( __always_inline__)) void _mm_sfence (void)
 {
   __builtin_ia32_sfence ();
 }
-#endif
+#endif /* __SSE3__ */
 
 static __inline__ __attribute__((always_inline)) void __stosb(unsigned char *dest, unsigned char data, size_t count)
 {
    __asm__ __volatile__ (
-    "cld ; rep ; stosb "
-    : "=D" (dest), "=c" (count)
-    : "a"(data), "0"(dest), "1" (count)
+    "rep ; stosb "
+    : "+D" (dest), "+c" (count)
+    : "a"(data)
   );
 }
 
 static __inline__ __attribute__((always_inline)) void __movsb(unsigned char *dest, unsigned char *data, size_t count)
 {
    __asm__ __volatile__ (
-    "cld ; rep ; movsb "
-    : "=D" (dest), "=S"(data), "=c" (count)
-    : "S"(data), "0"(dest), "1" (count)
+    "movsb "
+    : "+D" (dest), "+S"(data), "+c" (count)
   );
 }
 
@@ -633,4 +648,4 @@ void delay_point ( unsigned short Port, unsigned long Data, unsigned long delayT
     Index ++;
   }
 }
-#endif // defined (__GNUC__)
+#endif /* defined (__GNUC__) */