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ARM atomic ops rewrite

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Implement ARMv6 atomic ops (ldrex/strex) using the same trick as PPC.

Signed-off-by: Paul Brook <paul@codesourcery.com>
This commit is contained in:
Paul Brook 2009-11-22 21:35:13 +00:00
parent eee4850422
commit 426f5abcaa
5 changed files with 251 additions and 176 deletions
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80
linux-user/main.c
View file

@ -524,6 +524,81 @@ do_kernel_trap(CPUARMState *env)
return 0;
}
static int do_strex(CPUARMState *env)
{
uint32_t val;
int size;
int rc = 1;
int segv = 0;
uint32_t addr;
start_exclusive();
addr = env->exclusive_addr;
if (addr != env->exclusive_test) {
goto fail;
}
size = env->exclusive_info & 0xf;
switch (size) {
case 0:
segv = get_user_u8(val, addr);
break;
case 1:
segv = get_user_u16(val, addr);
break;
case 2:
case 3:
segv = get_user_u32(val, addr);
break;
}
if (segv) {
env->cp15.c6_data = addr;
goto done;
}
if (val != env->exclusive_val) {
goto fail;
}
if (size == 3) {
segv = get_user_u32(val, addr + 4);
if (segv) {
env->cp15.c6_data = addr + 4;
goto done;
}
if (val != env->exclusive_high) {
goto fail;
}
}
val = env->regs[(env->exclusive_info >> 8) & 0xf];
switch (size) {
case 0:
segv = put_user_u8(val, addr);
break;
case 1:
segv = put_user_u16(val, addr);
break;
case 2:
case 3:
segv = put_user_u32(val, addr);
break;
}
if (segv) {
env->cp15.c6_data = addr;
goto done;
}
if (size == 3) {
val = env->regs[(env->exclusive_info >> 12) & 0xf];
segv = put_user_u32(val, addr);
if (segv) {
env->cp15.c6_data = addr + 4;
goto done;
}
}
rc = 0;
fail:
env->regs[(env->exclusive_info >> 4) & 0xf] = rc;
done:
end_exclusive();
return segv;
}
void cpu_loop(CPUARMState *env)
{
int trapnr;
@ -717,6 +792,11 @@ void cpu_loop(CPUARMState *env)
if (do_kernel_trap(env))
goto error;
break;
case EXCP_STREX:
if (do_strex(env)) {
addr = env->cp15.c6_data;
goto do_segv;
}
default:
error:
fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",