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atomicity.h: Add support for compiling Thumb code.

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* config/cpu/arm/bits/atomicity.h: Add support for compiling Thumb
code.

From-SVN: r38033
This commit is contained in:
Richard Earnshaw 2000-12-05 10:36:33 +00:00 • committed by Richard Earnshaw
parent 11b176c156
commit 529dec15d8
2 changed files with 165 additions and 23 deletions
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5
libstdc++-v3/ChangeLog
View file

@ -1,3 +1,8 @@
2000-12-05 Richard Earnshaw <rearnsha@arm.com>
* config/cpu/arm/bits/atomicity.h: Add support for compiling Thumb
code.
2000-12-05 Richard Earnshaw <rearnsha@arm.com>
Support for NetBSD.

183
libstdc++-v3/config/cpu/arm/bits/atomicity.h
View file

@ -27,19 +27,46 @@ __attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __tmp, __tmp2, __result;
#ifdef __thumb__
/* Since this function is inlined, we can't be sure of the alignment. */
__asm__ __volatile__ (
"ldr %0, 4f \n\t"
"bx %0 \n\t"
".align 0 \n"
"4:\t"
".word 0f \n\t"
".code 32 \n"
"0:\t"
"ldr %0, [%3] \n\t"
"add %1, %0, %4 \n\t"
"swp %2, %1, [%3] \n\t"
"cmp %0, %2 \n\t"
"swpne %1, %2, [%3] \n\t"
"bne 0b \n\t"
"ldr %1, 1f \n\t"
"bx %1 \n"
"1:\t"
".word 2f \n\t"
".code 16 \n"
"2:\n"
: "=&l"(__result), "=&r"(__tmp), "=&r"(__tmp2)
: "r" (__mem), "r"(__val)
: "cc", "memory");
#else
__asm__ __volatile__ (
"\n"
"0:\t"
"ldr %0,[%3] \n\t"
"add %1,%0,%4 \n\t"
"swp %2,%1,[%3] \n\t"
"cmp %0,%2 \n\t"
"swpne %1,%2,[%3] \n\t"
"ldr %0, [%3] \n\t"
"add %1, %0, %4 \n\t"
"swp %2, %1, [%3] \n\t"
"cmp %0, %2 \n\t"
"swpne %1, %2, [%3] \n\t"
"bne 0b \n\t"
""
: "=&r"(__result), "=&r"(__tmp), "=&r"(__tmp2)
: "r" (__mem), "r"(__val)
: "cc", "memory");
#endif
return __result;
}
@ -48,19 +75,46 @@ __attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __tmp, __tmp2, __tmp3;
#ifdef __thumb__
/* Since this function is inlined, we can't be sure of the alignment. */
__asm__ __volatile__ (
"ldr %0, 4f \n\t"
"bx %0 \n\t"
".align 0\n"
"4:\t"
".word 0f \n\t"
".code 32 \n"
"0:\t"
"ldr %0, [%3] \n\t"
"add %1, %0, %4 \n\t"
"swp %2, %1, [%3] \n\t"
"cmp %0, %2 \n\t"
"swpne %1, %2,[%3] \n\t"
"bne 0b \n\t"
"ldr %1, 1f \n\t"
"bx %1 \n"
"1:\t"
".word 2f \n\t"
".code 16 \n"
"2:\n"
: "=&l"(__tmp), "=&r"(__tmp2), "=&r"(__tmp3)
: "r" (__mem), "r"(__val)
: "cc", "memory");
#else
__asm__ __volatile__ (
"\n"
"0:\t"
"ldr %0,[%3] \n\t"
"add %1,%0,%4 \n\t"
"swp %2,%1,[%3] \n\t"
"cmp %0,%2 \n\t"
"swpne %1,%2,[%3] \n\t"
"ldr %0, [%3] \n\t"
"add %1, %0, %4 \n\t"
"swp %2, %1, [%3] \n\t"
"cmp %0, %2 \n\t"
"swpne %1, %2, [%3] \n\t"
"bne 0b \n\t"
""
: "=&r"(__tmp), "=&r"(__tmp2), "=&r"(__tmp3)
: "r" (__mem), "r"(__val)
: "cc", "memory");
#endif
}
static inline int
@ -69,23 +123,54 @@ __compare_and_swap (volatile long *__p, long __oldval, long __newval)
{
int __result;
long __tmp;
#ifdef __thumb__
/* Since this function is inlined, we can't be sure of the alignment. */
__asm__ __volatile__ (
"ldr %0, 4f \n\t"
"bx %0 \n\t"
".align 0 \n"
"4:\t"
".word 0f \n\t"
".code 32 \n"
"0:\t"
"ldr %1, [%2] \n\t"
"mov %0, #0 \n\t"
"cmp %1, %4 \n\t"
"bne 1f \n\t"
"swp %0, %3, [%2] \n\t"
"cmp %1, %0 \n\t"
"swpne %1, %0, [%2] \n\t"
"bne 0b \n\t"
"mov %0, #1 \n"
"1:\t"
"ldr %1, 2f \n\t"
"bx %1 \n"
"2:\t"
".word 3f \n\t"
".code 16\n"
"3:\n"
: "=&l"(__result), "=&r"(__tmp)
: "r" (__p), "r" (__newval), "r" (__oldval)
: "cc", "memory");
#else
__asm__ __volatile__ (
"\n"
"0:\t"
"ldr %1,[%2] \n\t"
"mov %0,#0 \n\t"
"cmp %1,%4 \n\t"
"ldr %1, [%2] \n\t"
"mov %0, #0 \n\t"
"cmp %1, %4 \n\t"
"bne 1f \n\t"
"swp %0,%3,[%2] \n\t"
"cmp %1,%0 \n\t"
"swpne %1,%0,[%2] \n\t"
"swp %0, %3, [%2] \n\t"
"cmp %1, %0 \n\t"
"swpne %1, %0, [%2] \n\t"
"bne 0b \n\t"
"mov %0,#1 \n"
"mov %0, #1 \n"
"1:\n\t"
""
: "=&r"(__result), "=&r"(__tmp)
: "r" (__p), "r" (__newval), "r" (__oldval)
: "cc", "memory");
#endif
return __result;
}
@ -94,13 +179,36 @@ __attribute__ ((__unused__))
__always_swap (volatile long *__p, long __newval)
{
long __result;
#ifdef __thumb__
long __tmp;
/* Since this function is inlined, we can't be sure of the alignment. */
__asm__ __volatile__ (
"ldr %0, 4f \n\t"
"bx %0 \n\t"
".align 0 \n"
"4:\t"
".word 0f \n\t"
".code 32\n"
"0:\t"
"swp %0, %3, [%2] \n\t"
"ldr %1, 1f \n\t"
"bx %1 \n"
"1:\t"
".word 2f \n\t"
".code 16 \n"
"2:\n"
: "=&l"(__result), "=&r"(__tmp)
: "r"(__p), "r"(__newval)
: "memory");
#else
__asm__ __volatile__ (
"\n\t"
"swp %0,%2,[%1] \n\t"
"swp %0, %2, [%1] \n\t"
""
: "=&r"(__result)
: "r"(__p), "r"(__newval)
: "memory");
#endif
return __result;
}
@ -110,21 +218,50 @@ __test_and_set (volatile long *__p, long __newval)
{
int __result;
long __tmp;
#ifdef __thumb__
/* Since this function is inlined, we can't be sure of the alignment. */
__asm__ __volatile__ (
"ldr %0, 4f \n\t"
"bx %0 \n\t"
".align 0 \n"
"4:\t"
".word 0f \n\t"
".code 32 \n"
"0:\t"
"ldr %0, [%2] \n\t"
"cmp %0, #0 \n\t"
"bne 1f \n\t"
"swp %1, %3, [%2] \n\t"
"cmp %0, %1 \n\t"
"swpne %0, %1, [%2]\n\t"
"bne 0b \n"
"1:\t"
"ldr %1, 2f \n\t"
"bx %1 \n"
"2:\t"
".word 3f \n\t"
".code 16 \n"
"3:"
: "=&l"(__result), "=r" (__tmp)
: "r"(__p), "r"(__newval)
: "cc", "memory");
#else
__asm__ __volatile__ (
"\n"
"0:\t"
"ldr %0,[%2] \n\t"
"cmp %0,#0 \n\t"
"ldr %0, [%2] \n\t"
"cmp %0, #0 \n\t"
"bne 1f \n\t"
"swp %1,%3,[%2] \n\t"
"cmp %0,%1 \n\t"
"swpne %0,%1,[%2] \n\t"
"swp %1, %3, [%2] \n\t"
"cmp %0, %1 \n\t"
"swpne %0, %1, [%2] \n\t"
"bne 0b \n"
"1:\n\t"
""
: "=&r"(__result), "=r" (__tmp)
: "r"(__p), "r"(__newval)
: "cc", "memory");
#endif
return __result;
}