target-arm: Add exception target el infrastructure

Add a CPU state exception target EL field that will be used for communicating
the EL to which an exception should be routed.

Add a disassembly context field for tracking the EL3 architecture needed for
determining the target exception EL.

Add a target EL argument to the generic exception helper for callers to specify
the EL to which the exception should be routed.  Extended the helper to set
the newly added CPU state exception target el.

Added a function for setting the target exception EL and updated calls to helpers
to call it.

Signed-off-by: Greg Bellows <greg.bellows@linaro.org>
Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1429722561-12651-2-git-send-email-greg.bellows@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 42 insertions, 23 deletions

diff --git a/target-arm/translate.c b/target-arm/translate.c
index 9116529306..2bd573354f 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -217,12 +217,16 @@ static void gen_exception_internal(int excp)
     tcg_temp_free_i32(tcg_excp);
 }
 
-static void gen_exception(int excp, uint32_t syndrome)
+static void gen_exception(int excp, uint32_t syndrome, uint32_t target_el)
 {
     TCGv_i32 tcg_excp = tcg_const_i32(excp);
     TCGv_i32 tcg_syn = tcg_const_i32(syndrome);
+    TCGv_i32 tcg_el = tcg_const_i32(target_el);
 
-    gen_helper_exception_with_syndrome(cpu_env, tcg_excp, tcg_syn);
+    gen_helper_exception_with_syndrome(cpu_env, tcg_excp,
+                                       tcg_syn, tcg_el);
+
+    tcg_temp_free_i32(tcg_el);
     tcg_temp_free_i32(tcg_syn);
     tcg_temp_free_i32(tcg_excp);
 }
@@ -250,7 +254,8 @@ static void gen_step_complete_exception(DisasContext *s)
      * of the exception, and our syndrome information is always correct.
      */
     gen_ss_advance(s);
-    gen_exception(EXCP_UDEF, syn_swstep(s->ss_same_el, 1, s->is_ldex));
+    gen_exception(EXCP_UDEF, syn_swstep(s->ss_same_el, 1, s->is_ldex),
+                  default_exception_el(s));
     s->is_jmp = DISAS_EXC;
 }
 
@@ -1013,11 +1018,12 @@ static void gen_exception_internal_insn(DisasContext *s, int offset, int excp)
     s->is_jmp = DISAS_JUMP;
 }
 
-static void gen_exception_insn(DisasContext *s, int offset, int excp, int syn)
+static void gen_exception_insn(DisasContext *s, int offset, int excp,
+                               int syn, uint32_t target_el)
 {
     gen_set_condexec(s);
     gen_set_pc_im(s, s->pc - offset);
-    gen_exception(excp, syn);
+    gen_exception(excp, syn, target_el);
     s->is_jmp = DISAS_JUMP;
 }
 
@@ -3040,7 +3046,8 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
      */
     if (!s->cpacr_fpen) {
         gen_exception_insn(s, 4, EXCP_UDEF,
-                           syn_fp_access_trap(1, 0xe, s->thumb));
+                           syn_fp_access_trap(1, 0xe, s->thumb),
+                           default_exception_el(s));
         return 0;
     }
 
@@ -4358,7 +4365,8 @@ static int disas_neon_ls_insn(DisasContext *s, uint32_t insn)
      */
     if (!s->cpacr_fpen) {
         gen_exception_insn(s, 4, EXCP_UDEF,
-                           syn_fp_access_trap(1, 0xe, s->thumb));
+                           syn_fp_access_trap(1, 0xe, s->thumb),
+                           default_exception_el(s));
         return 0;
     }
 
@@ -5096,7 +5104,8 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
      */
     if (!s->cpacr_fpen) {
         gen_exception_insn(s, 4, EXCP_UDEF,
-                           syn_fp_access_trap(1, 0xe, s->thumb));
+                           syn_fp_access_trap(1, 0xe, s->thumb),
+                           default_exception_el(s));
         return 0;
     }
 
@@ -7960,7 +7969,8 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
                 /* bkpt */
                 ARCH(5);
                 gen_exception_insn(s, 4, EXCP_BKPT,
-                                   syn_aa32_bkpt(imm16, false));
+                                   syn_aa32_bkpt(imm16, false),
+                                   default_exception_el(s));
                 break;
             case 2:
                 /* Hypervisor call (v7) */
@@ -9021,7 +9031,8 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
             break;
         default:
         illegal_op:
-            gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized());
+            gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized(),
+                               default_exception_el(s));
             break;
         }
     }
@@ -10858,7 +10869,8 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s)
         {
             int imm8 = extract32(insn, 0, 8);
             ARCH(5);
-            gen_exception_insn(s, 2, EXCP_BKPT, syn_aa32_bkpt(imm8, true));
+            gen_exception_insn(s, 2, EXCP_BKPT, syn_aa32_bkpt(imm8, true),
+                               default_exception_el(s));
             break;
         }
 
@@ -11013,11 +11025,13 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s)
     }
     return;
 undef32:
-    gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized());
+    gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized(),
+                       default_exception_el(s));
     return;
 illegal_op:
 undef:
-    gen_exception_insn(s, 2, EXCP_UDEF, syn_uncategorized());
+    gen_exception_insn(s, 2, EXCP_UDEF, syn_uncategorized(),
+                       default_exception_el(s));
 }
 
 /* generate intermediate code in gen_opc_buf and gen_opparam_buf for
@@ -11057,6 +11071,7 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
     dc->condjmp = 0;
 
     dc->aarch64 = 0;
+    dc->el3_is_aa64 = arm_el_is_aa64(env, 3);
     dc->thumb = ARM_TBFLAG_THUMB(tb->flags);
     dc->bswap_code = ARM_TBFLAG_BSWAP_CODE(tb->flags);
     dc->condexec_mask = (ARM_TBFLAG_CONDEXEC(tb->flags) & 0xf) << 1;
@@ -11216,7 +11231,8 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
              * bits should be zero.
              */
             assert(num_insns == 0);
-            gen_exception(EXCP_UDEF, syn_swstep(dc->ss_same_el, 0, 0));
+            gen_exception(EXCP_UDEF, syn_swstep(dc->ss_same_el, 0, 0),
+                          default_exception_el(dc));
             goto done_generating;
         }
 
@@ -11276,13 +11292,14 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
             gen_set_condexec(dc);
             if (dc->is_jmp == DISAS_SWI) {
                 gen_ss_advance(dc);
-                gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb));
+                gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb),
+                              default_exception_el(dc));
             } else if (dc->is_jmp == DISAS_HVC) {
                 gen_ss_advance(dc);
-                gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm));
+                gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm), 2);
             } else if (dc->is_jmp == DISAS_SMC) {
                 gen_ss_advance(dc);
-                gen_exception(EXCP_SMC, syn_aa32_smc());
+                gen_exception(EXCP_SMC, syn_aa32_smc(), 3);
             } else if (dc->ss_active) {
                 gen_step_complete_exception(dc);
             } else {
@@ -11297,13 +11314,14 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
         gen_set_condexec(dc);
         if (dc->is_jmp == DISAS_SWI && !dc->condjmp) {
             gen_ss_advance(dc);
-            gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb));
+            gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb),
+                          default_exception_el(dc));
         } else if (dc->is_jmp == DISAS_HVC && !dc->condjmp) {
             gen_ss_advance(dc);
-            gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm));
+            gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm), 2);
         } else if (dc->is_jmp == DISAS_SMC && !dc->condjmp) {
             gen_ss_advance(dc);
-            gen_exception(EXCP_SMC, syn_aa32_smc());
+            gen_exception(EXCP_SMC, syn_aa32_smc(), 3);
         } else if (dc->ss_active) {
             gen_step_complete_exception(dc);
         } else {
@@ -11341,13 +11359,14 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
             gen_helper_wfe(cpu_env);
             break;
         case DISAS_SWI:
-            gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb));
+            gen_exception(EXCP_SWI, syn_aa32_svc(dc->svc_imm, dc->thumb),
+                          default_exception_el(dc));
             break;
         case DISAS_HVC:
-            gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm));
+            gen_exception(EXCP_HVC, syn_aa32_hvc(dc->svc_imm), 2);
             break;
         case DISAS_SMC:
-            gen_exception(EXCP_SMC, syn_aa32_smc());
+            gen_exception(EXCP_SMC, syn_aa32_smc(), 3);
             break;
         }
         if (dc->condjmp) {