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authorPaul Brook <paul@codesourcery.com>2009-07-09 17:45:17 +0100
committerPaul Brook <paul@codesourcery.com>2009-07-09 17:45:17 +0100
commit590bc601d800d16a77676926898019f7285bd615 (patch)
tree85cfd216edb9e8a3068cb4848f238e1fe4fdef58 /linux-user
parentff867ddcbd55af7becd2328a454e0158018fb50e (diff)
MIPS atomic instructions
Implement MIPS ll/sc instructions using atomic compare+exchange. Signed-off-by: Paul Brook <paul@codesourcery.com>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/main.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/linux-user/main.c b/linux-user/main.c
index 734844746b..30290a5837 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -1826,6 +1826,55 @@ static const uint8_t mips_syscall_args[] = {
#undef MIPS_SYS
+static int do_store_exclusive(CPUMIPSState *env)
+{
+ target_ulong addr;
+ target_ulong page_addr;
+ target_ulong val;
+ int flags;
+ int segv = 0;
+ int reg;
+ int d;
+
+ addr = env->CP0_LLAddr;
+ page_addr = addr & TARGET_PAGE_MASK;
+ start_exclusive();
+ mmap_lock();
+ flags = page_get_flags(page_addr);
+ if ((flags & PAGE_READ) == 0) {
+ segv = 1;
+ } else {
+ reg = env->llreg & 0x1f;
+ d = (env->llreg & 0x20) != 0;
+ if (d) {
+ segv = get_user_s64(val, addr);
+ } else {
+ segv = get_user_s32(val, addr);
+ }
+ if (!segv) {
+ if (val != env->llval) {
+ env->active_tc.gpr[reg] = 0;
+ } else {
+ if (d) {
+ segv = put_user_u64(env->llnewval, addr);
+ } else {
+ segv = put_user_u32(env->llnewval, addr);
+ }
+ if (!segv) {
+ env->active_tc.gpr[reg] = 1;
+ }
+ }
+ }
+ }
+ env->CP0_LLAddr = -1;
+ if (!segv) {
+ env->active_tc.PC += 4;
+ }
+ mmap_unlock();
+ end_exclusive();
+ return segv;
+}
+
void cpu_loop(CPUMIPSState *env)
{
target_siginfo_t info;
@@ -1833,7 +1882,9 @@ void cpu_loop(CPUMIPSState *env)
unsigned int syscall_num;
for(;;) {
+ cpu_exec_start(env);
trapnr = cpu_mips_exec(env);
+ cpu_exec_end(env);
switch(trapnr) {
case EXCP_SYSCALL:
syscall_num = env->active_tc.gpr[2] - 4000;
@@ -1910,6 +1961,15 @@ void cpu_loop(CPUMIPSState *env)
}
}
break;
+ case EXCP_SC:
+ if (do_store_exclusive(env)) {
+ info.si_signo = TARGET_SIGSEGV;
+ info.si_errno = 0;
+ info.si_code = TARGET_SEGV_MAPERR;
+ info._sifields._sigfault._addr = env->active_tc.PC;
+ queue_signal(env, info.si_signo, &info);
+ }
+ break;
default:
// error:
fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",