qemu: Apply fix for armv6 locale generation using TLS registers

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

2 files changed, 133 insertions, 1 deletions

diff --git a/meta/recipes-devtools/qemu/qemu-0.12.4/arm-cp15-fix.patch b/meta/recipes-devtools/qemu/qemu-0.12.4/arm-cp15-fix.patch
new file mode 100644
index 0000000000..1e0ea43083
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu-0.12.4/arm-cp15-fix.patch
@@ -0,0 +1,131 @@
+From: Riku Voipio <riku.voipio@nokia.com>
+
+Access the cp15.c13 TLS registers directly with TCG ops instead of with
+a slow helper. If the the cp15 read/write was not TLS register access,
+fall back to the cp15 helper.
+
+This makes accessing __thread variables in linux-user when apps are compiled
+with -mtp=cp15 possible. legal cp15 register to acces from linux-user are
+already checked in cp15_user_ok.
+
+While at it, make the cp15.c13 Thread ID registers available only on
+ARMv6K and newer.
+
+Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
+Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
+
+diff --git a/target-arm/helper.c b/target-arm/helper.c
+index b3aec99..27001e8 100644
+--- a/target-arm/helper.c
++++ b/target-arm/helper.c
+@@ -511,7 +511,6 @@  void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
+ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
+ {
+     cpu_abort(env, "cp15 insn %08x\n", insn);
+-    return 0;
+ }
+ 
+ /* These should probably raise undefined insn exceptions.  */
+@@ -1491,15 +1490,6 @@  void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
+               tlb_flush(env, 0);
+             env->cp15.c13_context = val;
+             break;
+-        case 2:
+-            env->cp15.c13_tls1 = val;
+-            break;
+-        case 3:
+-            env->cp15.c13_tls2 = val;
+-            break;
+-        case 4:
+-            env->cp15.c13_tls3 = val;
+-            break;
+         default:
+             goto bad_reg;
+         }
+@@ -1779,12 +1769,6 @@  uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
+             return env->cp15.c13_fcse;
+         case 1:
+             return env->cp15.c13_context;
+-        case 2:
+-            return env->cp15.c13_tls1;
+-        case 3:
+-            return env->cp15.c13_tls2;
+-        case 4:
+-            return env->cp15.c13_tls3;
+         default:
+             goto bad_reg;
+         }
+diff --git a/target-arm/translate.c b/target-arm/translate.c
+index 5cf3e06..786c329 100644
+--- a/target-arm/translate.c
++++ b/target-arm/translate.c
+@@ -2455,6 +2455,57 @@  static int cp15_user_ok(uint32_t insn)
+     return 0;
+ }
+ 
++static int cp15_tls_load_store(CPUState *env, DisasContext *s, uint32_t insn, uint32_t rd)
++{
++    TCGv tmp;
++    int cpn = (insn >> 16) & 0xf;
++    int cpm = insn & 0xf;
++    int op = ((insn >> 5) & 7) | ((insn >> 18) & 0x38);
++
++    if (!arm_feature(env, ARM_FEATURE_V6K))
++        return 0;
++
++    if (!(cpn == 13 && cpm == 0))
++        return 0;
++
++    if (insn & ARM_CP_RW_BIT) {
++        tmp = new_tmp();
++        switch (op) {
++        case 2:
++            tcg_gen_ld_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls1));
++            break;
++        case 3:
++            tcg_gen_ld_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls2));
++            break;
++        case 4:
++            tcg_gen_ld_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls3));
++            break;
++        default:
++            dead_tmp(tmp);
++            return 0;
++        }
++        store_reg(s, rd, tmp);
++
++    } else {
++        tmp = load_reg(s, rd);
++        switch (op) {
++        case 2:
++            tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls1));
++            break;
++        case 3:
++            tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls2));
++            break;
++        case 4:
++            tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls3));
++            break;
++        default:
++            return 0;
++        }
++        dead_tmp(tmp);
++    }
++    return 1;
++}
++
+ /* Disassemble system coprocessor (cp15) instruction.  Return nonzero if
+    instruction is not defined.  */
+ static int disas_cp15_insn(CPUState *env, DisasContext *s, uint32_t insn)
+@@ -2489,6 +2540,10 @@  static int disas_cp15_insn(CPUState *env, DisasContext *s, uint32_t insn)
+         return 0;
+     }
+     rd = (insn >> 12) & 0xf;
++
++    if (cp15_tls_load_store(env, s, insn, rd))
++        return 0;
++
+     tmp2 = tcg_const_i32(insn);
+     if (insn & ARM_CP_RW_BIT) {
+         tmp = new_tmp();
+
diff --git a/meta/recipes-devtools/qemu/qemu_0.12.4.bb b/meta/recipes-devtools/qemu/qemu_0.12.4.bb
index ac197d756a..e448eb9b17 100644
--- a/meta/recipes-devtools/qemu/qemu_0.12.4.bb
+++ b/meta/recipes-devtools/qemu/qemu_0.12.4.bb
@@ -1,6 +1,6 @@
 require qemu.inc
 
-PR = "r19"
+PR = "r20"
 
 FILESPATH = "${FILE_DIRNAME}/qemu-${PV}"
 FILESDIR = "${WORKDIR}"
@@ -18,6 +18,7 @@ SRC_URI = "\
     file://qemu-vmware-vga-depth.patch \
     file://qemu-ppc-hack.patch \
     file://enable-i386-linux-user.patch \
+    file://arm-cp15-fix.patch \
     file://powerpc_rom.bin"
 
 do_install_append () {