[Qemu-devel] [PATCH 4/5] linux-user: Add access to TLS registers

[Riku Voipio <riku.voipio@iki.fi>]

From: Riku Voipio <riku.voipio@nokia.com>

If you compile applications with gcc -mtp=cp15, __thread
access's will generate an abort. Implement accessing allowed
cp15.c13 registers on ARMv6K+ in linux-user.

Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
---
 target-arm/helper.c |   27 ++++++++++++++++++++++++++-
 1 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index b3aec99..68578ce 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -505,13 +505,38 @@ uint32_t HELPER(get_cp)(CPUState *env, uint32_t insn)
 
 void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
 {
+    int op2;
+
+    op2 = (insn >> 5) & 7;
+    /* Allow write access to CP15 User RW Thread ID Register */
+    if (arm_feature (env, ARM_FEATURE_V6K) && ((insn >> 16) & 0xf) == 13) {
+        switch (op2) {
+        case 2:
+            env->cp15.c13_tls1 = val;
+            return;
+        }
+    }
     cpu_abort(env, "cp15 insn %08x\n", insn);
 }
 
 uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
 {
+    int op2;
+    /* Allow read access to CP15 User RW and RO Thread ID Registers */
+
+    op2 = (insn >> 5) & 7;
+    if (arm_feature (env, ARM_FEATURE_V6K) && ((insn >> 16) & 0xf) == 13) {
+        switch (op2) {
+        case 2:
+            return env->cp15.c13_tls1;
+        case 3:
+            return env->cp15.c13_tls2;
+        default:
+            goto bad_reg;
+        }
+    }
+bad_reg:
     cpu_abort(env, "cp15 insn %08x\n", insn);
-    return 0;
 }
 
 /* These should probably raise undefined insn exceptions.  */
-- 
1.6.5