about summary refs log tree commit diff
path: root/arch/arm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/atomic.h194
-rw-r--r--arch/arm/pthread_arch.h14
-rw-r--r--arch/arm/src/__set_thread_area.c50
-rw-r--r--arch/arm/src/arm/atomics.s116
-rw-r--r--arch/arm/src/atomics.c0
5 files changed, 330 insertions, 44 deletions
diff --git a/arch/arm/atomic.h b/arch/arm/atomic.h
index 8665c874..8ae35bb7 100644
--- a/arch/arm/atomic.h
+++ b/arch/arm/atomic.h
@@ -22,37 +22,150 @@ static inline int a_ctz_64(uint64_t x)
 	return a_ctz_l(y);
 }
 
-#if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6ZK__) && !__thumb__) \
- || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
-
 #if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ ||  __ARM_ARCH >= 7
-#define MEM_BARRIER "dmb ish"
-#else
-#define MEM_BARRIER "mcr p15,0,r0,c7,c10,5"
-#endif
 
-static inline int __k_cas(int t, int s, volatile int *p)
+static inline void a_barrier()
 {
-	int ret;
-	__asm__(
-		"	" MEM_BARRIER "\n"
+	__asm__ __volatile__("dmb ish");
+}
+
+static inline int a_cas(volatile int *p, int t, int s)
+{
+	int old;
+	__asm__ __volatile__(
+		"	dmb ish\n"
 		"1:	ldrex %0,%3\n"
-		"	subs %0,%0,%1\n"
-#ifdef __thumb__
-		"	itt eq\n"
-#endif
-		"	strexeq %0,%2,%3\n"
-		"	teqeq %0,#1\n"
-		"	beq 1b\n"
-		"	" MEM_BARRIER "\n"
-		: "=&r"(ret)
+		"	cmp %0,%1\n"
+		"	bne 1f\n"
+		"	strex %0,%2,%3\n"
+		"	cmp %0, #0\n"
+		"	bne 1b\n"
+		"	mov %0, %1\n"
+		"1:	dmb ish\n"
+		: "=&r"(old)
 		: "r"(t), "r"(s), "Q"(*p)
 		: "memory", "cc" );
-	return ret;
+	return old;
+}
+
+static inline int a_swap(volatile int *x, int v)
+{
+	int old, tmp;
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"1:	ldrex %0,%3\n"
+		"	strex %1,%2,%3\n"
+		"	cmp %1, #0\n"
+		"	bne 1b\n"
+		"	dmb ish\n"
+		: "=&r"(old), "=&r"(tmp)
+		: "r"(v), "Q"(*x)
+		: "memory", "cc" );
+	return old;
+}
+
+static inline int a_fetch_add(volatile int *x, int v)
+{
+	int old, tmp;
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"1:	ldrex %0,%3\n"
+		"	add %0,%0,%2\n"
+		"	strex %1,%0,%3\n"
+		"	cmp %1, #0\n"
+		"	bne 1b\n"
+		"	dmb ish\n"
+		: "=&r"(old), "=&r"(tmp)
+		: "r"(v), "Q"(*x)
+		: "memory", "cc" );
+	return old-v;
+}
+
+static inline void a_inc(volatile int *x)
+{
+	int tmp, tmp2;
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"1:	ldrex %0,%2\n"
+		"	add %0,%0,#1\n"
+		"	strex %1,%0,%2\n"
+		"	cmp %1, #0\n"
+		"	bne 1b\n"
+		"	dmb ish\n"
+		: "=&r"(tmp), "=&r"(tmp2)
+		: "Q"(*x)
+		: "memory", "cc" );
+}
+
+static inline void a_dec(volatile int *x)
+{
+	int tmp, tmp2;
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"1:	ldrex %0,%2\n"
+		"	sub %0,%0,#1\n"
+		"	strex %1,%0,%2\n"
+		"	cmp %1, #0\n"
+		"	bne 1b\n"
+		"	dmb ish\n"
+		: "=&r"(tmp), "=&r"(tmp2)
+		: "Q"(*x)
+		: "memory", "cc" );
+}
+
+static inline void a_and(volatile int *x, int v)
+{
+	int tmp, tmp2;
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"1:	ldrex %0,%3\n"
+		"	and %0,%0,%2\n"
+		"	strex %1,%0,%3\n"
+		"	cmp %1, #0\n"
+		"	bne 1b\n"
+		"	dmb ish\n"
+		: "=&r"(tmp), "=&r"(tmp2)
+		: "r"(v), "Q"(*x)
+		: "memory", "cc" );
+}
+
+static inline void a_or(volatile int *x, int v)
+{
+	int tmp, tmp2;
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"1:	ldrex %0,%3\n"
+		"	orr %0,%0,%2\n"
+		"	strex %1,%0,%3\n"
+		"	cmp %1, #0\n"
+		"	bne 1b\n"
+		"	dmb ish\n"
+		: "=&r"(tmp), "=&r"(tmp2)
+		: "r"(v), "Q"(*x)
+		: "memory", "cc" );
+}
+
+static inline void a_store(volatile int *p, int x)
+{
+	__asm__ __volatile__(
+		"	dmb ish\n"
+		"	str %1,%0\n"
+		"	dmb ish\n"
+		: "=m"(*p)
+		: "r"(x)
+		: "memory", "cc" );
 }
+
 #else
-#define __k_cas ((int (*)(int, int, volatile int *))0xffff0fc0)
-#endif
+
+int __a_cas(int, int, volatile int *) __attribute__((__visibility__("hidden")));
+#define __k_cas __a_cas
+
+static inline void a_barrier()
+{
+	__asm__ __volatile__("bl __a_barrier"
+		: : : "memory", "cc", "ip", "lr" );
+}
 
 static inline int a_cas(volatile int *p, int t, int s)
 {
@@ -65,11 +178,6 @@ static inline int a_cas(volatile int *p, int t, int s)
 	}
 }
 
-static inline void *a_cas_p(volatile void *p, void *t, void *s)
-{
-	return (void *)a_cas(p, (int)t, (int)s);
-}
-
 static inline int a_swap(volatile int *x, int v)
 {
 	int old;
@@ -98,19 +206,9 @@ static inline void a_dec(volatile int *x)
 
 static inline void a_store(volatile int *p, int x)
 {
-	while (__k_cas(*p, x, p));
-}
-
-#define a_spin a_barrier
-
-static inline void a_barrier()
-{
-	__k_cas(0, 0, &(int){0});
-}
-
-static inline void a_crash()
-{
-	*(volatile char *)0=0;
+	a_barrier();
+	*p = x;
+	a_barrier();
 }
 
 static inline void a_and(volatile int *p, int v)
@@ -127,6 +225,20 @@ static inline void a_or(volatile int *p, int v)
 	while (__k_cas(old, old|v, p));
 }
 
+#endif
+
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+	return (void *)a_cas(p, (int)t, (int)s);
+}
+
+#define a_spin a_barrier
+
+static inline void a_crash()
+{
+	*(volatile char *)0=0;
+}
+
 static inline void a_or_l(volatile void *p, long v)
 {
 	a_or(p, v);
diff --git a/arch/arm/pthread_arch.h b/arch/arm/pthread_arch.h
index 6d9dc3a6..7ab90580 100644
--- a/arch/arm/pthread_arch.h
+++ b/arch/arm/pthread_arch.h
@@ -10,9 +10,17 @@ static inline __attribute__((const)) pthread_t __pthread_self()
 
 #else
 
-typedef char *(*__ptr_func_t)(void) __attribute__((const));
-#define __pthread_self() \
-	((pthread_t)(((__ptr_func_t)0xffff0fe0)()+8-sizeof(struct pthread)))
+static inline __attribute__((const)) pthread_t __pthread_self()
+{
+#ifdef __clang__
+	char *p;
+	__asm__( "bl __a_gettp\n\tmov %0,r0" : "=r"(p) : : "cc", "r0", "lr" );
+#else
+	register char *p __asm__("r0");
+	__asm__( "bl __a_gettp" : "=r"(p) : : "cc", "lr" );
+#endif
+	return (void *)(p+8-sizeof(struct pthread));
+}
 
 #endif
 
diff --git a/arch/arm/src/__set_thread_area.c b/arch/arm/src/__set_thread_area.c
new file mode 100644
index 00000000..680510ea
--- /dev/null
+++ b/arch/arm/src/__set_thread_area.c
@@ -0,0 +1,50 @@
+#include <stdint.h>
+#include <elf.h>
+#include "pthread_impl.h"
+#include "libc.h"
+
+#define HWCAP_TLS (1 << 15)
+
+extern const unsigned char __attribute__((__visibility__("hidden")))
+	__a_barrier_dummy[], __a_barrier_oldkuser[],
+	__a_barrier_v6[], __a_barrier_v7[],
+	__a_cas_dummy[], __a_cas_v6[], __a_cas_v7[],
+	__a_gettp_dummy[], __a_gettp_native[];
+
+#define __a_barrier_kuser 0xffff0fa0
+#define __a_cas_kuser 0xffff0fc0
+#define __a_gettp_kuser 0xffff0fe0
+
+extern uintptr_t __attribute__((__visibility__("hidden")))
+	__a_barrier_ptr, __a_cas_ptr, __a_gettp_ptr;
+
+#define SET(op,ver) (__a_##op##_ptr = \
+	(uintptr_t)__a_##op##_##ver - (uintptr_t)__a_##op##_dummy)
+
+int __set_thread_area(void *p)
+{
+#if !__ARM_ARCH_7A__ && !__ARM_ARCH_7R__ && __ARM_ARCH < 7
+	if (__hwcap & HWCAP_TLS) {
+		size_t *aux;
+		SET(gettp, native);
+		SET(cas, v7);
+		SET(barrier, v7);
+		for (aux=libc.auxv; *aux; aux+=2) {
+			if (*aux != AT_PLATFORM) continue;
+			const char *s = (void *)aux[1];
+			if (s[0]!='v' || s[1]!='6' || s[2]-'0'<10u) break;
+			SET(cas, v6);
+			SET(barrier, v6);
+			break;
+		}
+	} else {
+		int ver = *(int *)0xffff0ffc;
+		SET(gettp, kuser);
+		SET(cas, kuser);
+		SET(barrier, kuser);
+		if (ver < 2) a_crash();
+		if (ver < 3) SET(barrier, oldkuser);
+	}
+#endif
+	return __syscall(0xf0005, p);
+}
diff --git a/arch/arm/src/arm/atomics.s b/arch/arm/src/arm/atomics.s
new file mode 100644
index 00000000..9fcc7bd7
--- /dev/null
+++ b/arch/arm/src/arm/atomics.s
@@ -0,0 +1,116 @@
+.text
+
+.global __a_barrier
+.hidden __a_barrier
+.type __a_barrier,%function
+__a_barrier:
+	ldr ip,1f
+	ldr ip,[pc,ip]
+	add pc,pc,ip
+1:	.word __a_barrier_ptr-1b
+.global __a_barrier_dummy
+.hidden __a_barrier_dummy
+__a_barrier_dummy:
+	tst lr,#1
+	moveq pc,lr
+	bx lr
+.global __a_barrier_oldkuser
+.hidden __a_barrier_oldkuser
+__a_barrier_oldkuser:
+	push {r0,r1,r2,r3,ip,lr}
+	mov r1,r0
+	mov r2,sp
+	ldr ip,=0xffff0fc0
+	mov lr,pc
+	mov pc,ip
+	pop {r0,r1,r2,r3,ip,lr}
+	tst lr,#1
+	moveq pc,lr
+	bx lr
+.global __a_barrier_v6
+.hidden __a_barrier_v6
+__a_barrier_v6:
+	mcr p15,0,r0,c7,c10,5
+	bx lr
+.global __a_barrier_v7
+.hidden __a_barrier_v7
+__a_barrier_v7:
+	.word 0xf57ff05b        /* dmb ish */
+	bx lr
+
+.global __a_cas
+.hidden __a_cas
+.type __a_cas,%function
+__a_cas:
+	ldr ip,1f
+	ldr ip,[pc,ip]
+	add pc,pc,ip
+1:	.word __a_cas_ptr-1b
+.global __a_cas_dummy
+.hidden __a_cas_dummy
+__a_cas_dummy:
+	mov r3,r0
+	ldr r0,[r2]
+	subs r0,r3,r0
+	streq r1,[r2]
+	tst lr,#1
+	moveq pc,lr
+	bx lr
+.global __a_cas_v6
+.hidden __a_cas_v6
+__a_cas_v6:
+	mov r3,r0
+	mcr p15,0,r0,c7,c10,5
+1:	.word 0xe1920f9f        /* ldrex r0,[r2] */
+	subs r0,r3,r0
+	.word 0x01820f91        /* strexeq r0,r1,[r2] */
+	teqeq r0,#1
+	beq 1b
+	mcr p15,0,r0,c7,c10,5
+	bx lr
+.global __a_cas_v7
+.hidden __a_cas_v7
+__a_cas_v7:
+	mov r3,r0
+	.word 0xf57ff05b        /* dmb ish */
+1:	.word 0xe1920f9f        /* ldrex r0,[r2] */
+	subs r0,r3,r0
+	.word 0x01820f91        /* strexeq r0,r1,[r2] */
+	teqeq r0,#1
+	beq 1b
+	.word 0xf57ff05b        /* dmb ish */
+	bx lr
+
+.global __a_gettp
+.hidden __a_gettp
+.type __a_gettp,%function
+__a_gettp:
+	ldr r0,1f
+	ldr r0,[pc,r0]
+	add pc,pc,r0
+1:	.word __a_gettp_ptr-1b
+.global __a_gettp_dummy
+.hidden __a_gettp_dummy
+__a_gettp_dummy:
+	.word 0xe7fddef1
+.global __a_gettp_native
+.hidden __a_gettp_native
+__a_gettp_native:
+	mrc p15,0,r0,c13,c0,3
+	bx lr
+
+.data
+.global __a_barrier_ptr
+.hidden __a_barrier_ptr
+__a_barrier_ptr:
+	.word 0
+
+.global __a_cas_ptr
+.hidden __a_cas_ptr
+__a_cas_ptr:
+	.word 0
+
+.global __a_gettp_ptr
+.hidden __a_gettp_ptr
+__a_gettp_ptr:
+	.word 0
diff --git a/arch/arm/src/atomics.c b/arch/arm/src/atomics.c
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/arch/arm/src/atomics.c
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-18 11:32:02 +0000