mirror of
https://github.com/fluencelabs/musl
synced 2025-06-08 12:31:34 +00:00
aacd348637
linux, gcc, etc. all use "sh" as the name for the superh arch. there was already some inconsistency internally in musl: the dynamic linker was searching for "ld-musl-sh.path" as its path file despite its own name being "ld-musl-superh.so.1". there was some sentiment in both directions as to how to resolve the inconsistency, but overall "sh" was favored.
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
#include "libc.h"
|
|
|
|
#define LLSC_CLOBBERS "r0", "t", "memory"
|
|
#define LLSC_START(mem) \
|
|
"0: movli.l @" mem ", r0\n"
|
|
#define LLSC_END(mem) \
|
|
"1: movco.l r0, @" mem "\n" \
|
|
" bf 0b\n" \
|
|
" synco\n"
|
|
|
|
/* gusa is a hack in the kernel which lets you create a sequence of instructions
|
|
* which will be restarted if the process is preempted in the middle of the
|
|
* sequence. It will do for implementing atomics on non-smp systems. ABI is:
|
|
* r0 = address of first instruction after the atomic sequence
|
|
* r1 = original stack pointer
|
|
* r15 = -1 * length of atomic sequence in bytes
|
|
*/
|
|
#define GUSA_CLOBBERS "r0", "r1", "memory"
|
|
#define GUSA_START(mem,old,nop) \
|
|
" .align 2\n" \
|
|
" mova 1f, r0\n" \
|
|
nop \
|
|
" mov r15, r1\n" \
|
|
" mov #(0f-1f), r15\n" \
|
|
"0: mov.l @" mem ", " old "\n"
|
|
/* the target of mova must be 4 byte aligned, so we may need a nop */
|
|
#define GUSA_START_ODD(mem,old) GUSA_START(mem,old,"")
|
|
#define GUSA_START_EVEN(mem,old) GUSA_START(mem,old,"\tnop\n")
|
|
#define GUSA_END(mem,new) \
|
|
" mov.l " new ", @" mem "\n" \
|
|
"1: mov r1, r15\n"
|
|
|
|
#define CPU_HAS_LLSC 0x0040
|
|
|
|
int __sh_cas(volatile int *p, int t, int s)
|
|
{
|
|
int old;
|
|
if (__hwcap & CPU_HAS_LLSC) {
|
|
__asm__ __volatile__(
|
|
LLSC_START("%1")
|
|
" mov r0, %0\n"
|
|
" cmp/eq %0, %2\n"
|
|
" bf 1f\n"
|
|
" mov %3, r0\n"
|
|
LLSC_END("%1")
|
|
: "=&r"(old) : "r"(p), "r"(t), "r"(s) : LLSC_CLOBBERS);
|
|
} else {
|
|
__asm__ __volatile__(
|
|
GUSA_START_EVEN("%1", "%0")
|
|
" cmp/eq %0, %2\n"
|
|
" bf 1f\n"
|
|
GUSA_END("%1", "%3")
|
|
: "=&r"(old) : "r"(p), "r"(t), "r"(s) : GUSA_CLOBBERS, "t");
|
|
}
|
|
return old;
|
|
}
|
|
|
|
int __sh_swap(volatile int *x, int v)
|
|
{
|
|
int old;
|
|
if (__hwcap & CPU_HAS_LLSC) {
|
|
__asm__ __volatile__(
|
|
LLSC_START("%1")
|
|
" mov r0, %0\n"
|
|
" mov %2, r0\n"
|
|
LLSC_END("%1")
|
|
: "=&r"(old) : "r"(x), "r"(v) : LLSC_CLOBBERS);
|
|
} else {
|
|
__asm__ __volatile__(
|
|
GUSA_START_EVEN("%1", "%0")
|
|
GUSA_END("%1", "%2")
|
|
: "=&r"(old) : "r"(x), "r"(v) : GUSA_CLOBBERS);
|
|
}
|
|
return old;
|
|
}
|
|
|
|
int __sh_fetch_add(volatile int *x, int v)
|
|
{
|
|
int old, dummy;
|
|
if (__hwcap & CPU_HAS_LLSC) {
|
|
__asm__ __volatile__(
|
|
LLSC_START("%1")
|
|
" mov r0, %0\n"
|
|
" add %2, r0\n"
|
|
LLSC_END("%1")
|
|
: "=&r"(old) : "r"(x), "r"(v) : LLSC_CLOBBERS);
|
|
} else {
|
|
__asm__ __volatile__(
|
|
GUSA_START_EVEN("%2", "%0")
|
|
" mov %0, %1\n"
|
|
" add %3, %1\n"
|
|
GUSA_END("%2", "%1")
|
|
: "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : GUSA_CLOBBERS);
|
|
}
|
|
return old;
|
|
}
|
|
|
|
void __sh_store(volatile int *p, int x)
|
|
{
|
|
if (__hwcap & CPU_HAS_LLSC) {
|
|
__asm__ __volatile__(
|
|
" mov.l %1, @%0\n"
|
|
" synco\n"
|
|
: : "r"(p), "r"(x) : "memory");
|
|
} else {
|
|
__asm__ __volatile__(
|
|
" mov.l %1, @%0\n"
|
|
: : "r"(p), "r"(x) : "memory");
|
|
}
|
|
}
|
|
|
|
void __sh_and(volatile int *x, int v)
|
|
{
|
|
int dummy;
|
|
if (__hwcap & CPU_HAS_LLSC) {
|
|
__asm__ __volatile__(
|
|
LLSC_START("%0")
|
|
" and %1, r0\n"
|
|
LLSC_END("%0")
|
|
: : "r"(x), "r"(v) : LLSC_CLOBBERS);
|
|
} else {
|
|
__asm__ __volatile__(
|
|
GUSA_START_ODD("%1", "%0")
|
|
" and %2, %0\n"
|
|
GUSA_END("%1", "%0")
|
|
: "=&r"(dummy) : "r"(x), "r"(v) : GUSA_CLOBBERS);
|
|
}
|
|
}
|
|
|
|
void __sh_or(volatile int *x, int v)
|
|
{
|
|
int dummy;
|
|
if (__hwcap & CPU_HAS_LLSC) {
|
|
__asm__ __volatile__(
|
|
LLSC_START("%0")
|
|
" or %1, r0\n"
|
|
LLSC_END("%0")
|
|
: : "r"(x), "r"(v) : LLSC_CLOBBERS);
|
|
} else {
|
|
__asm__ __volatile__(
|
|
GUSA_START_ODD("%1", "%0")
|
|
" or %2, %0\n"
|
|
GUSA_END("%1", "%0")
|
|
: "=&r"(dummy) : "r"(x), "r"(v) : GUSA_CLOBBERS);
|
|
}
|
|
}
|