[Qemu-devel] [PATCH 09/24] target-alpha: Add IPRs to be used by the emulation PALcode.

[Richard Henderson]

These aren't actually used yet, but we can at least access
them via the HW_MFPR and HW_MTPR instructions.

Signed-off-by: Richard Henderson <address@hidden>
---
 target-alpha/cpu.h       |   13 +++++++
 target-alpha/translate.c |   87 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 98 insertions(+), 2 deletions(-)

diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index 1c848bd..dec8b26 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -247,6 +247,7 @@ struct CPUAlphaState {
     uint8_t intr_flag;
     uint8_t fen;
     uint8_t pal_mode;
+    uint32_t pcc_ofs;
 
     /* These pass data from the exception logic in the translator and
        helpers to the OS entry point.  This is used for both system
@@ -255,6 +256,18 @@ struct CPUAlphaState {
     uint64_t trap_arg1;
     uint64_t trap_arg2;
 
+#if !defined(CONFIG_USER_ONLY)
+    /* The internal data required by our emulation of the Unix PALcode.  */
+    uint64_t exc_addr;
+    uint64_t palbr;
+    uint64_t ptbr;
+    uint64_t vptptr;
+    uint64_t sysval;
+    uint64_t usp;
+    uint64_t shadow[8];
+    uint64_t scratch[24];
+#endif
+
 #if TARGET_LONG_BITS > HOST_LONG_BITS
     /* temporary fixed-point registers
      * used to emulate 64 bits target on 32 bits hosts
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index d9b6a72..7c90ad9 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -1464,6 +1464,89 @@ static void gen_rx(int ra, int set)
     tcg_temp_free_i32(tmp);
 }
 
+#ifndef CONFIG_USER_ONLY
+
+#define PR_BYTE         0x100000
+#define PR_LONG         0x200000
+
+static int cpu_pr_data(int pr)
+{
+    switch (pr) {
+    case  0: return offsetof(CPUAlphaState, ps) | PR_BYTE;
+    case  1: return offsetof(CPUAlphaState, fen) | PR_BYTE;
+    case  2: return offsetof(CPUAlphaState, pcc_ofs) | PR_LONG;
+    case  3: return offsetof(CPUAlphaState, trap_arg0);
+    case  4: return offsetof(CPUAlphaState, trap_arg1);
+    case  5: return offsetof(CPUAlphaState, trap_arg2);
+    case  6: return offsetof(CPUAlphaState, exc_addr);
+    case  7: return offsetof(CPUAlphaState, palbr);
+    case  8: return offsetof(CPUAlphaState, ptbr);
+    case  9: return offsetof(CPUAlphaState, vptptr);
+    case 10: return offsetof(CPUAlphaState, unique);
+    case 11: return offsetof(CPUAlphaState, sysval);
+    case 12: return offsetof(CPUAlphaState, usp);
+
+    case 32 ... 39:
+        return offsetof(CPUAlphaState, shadow[pr - 32]);
+    case 40 ... 63:
+        return offsetof(CPUAlphaState, scratch[pr - 40]);
+    }
+    return 0;
+}
+
+static void gen_mfpr(int ra, int regno)
+{
+    int data = cpu_pr_data(regno);
+
+    /* In our emulated PALcode, these processor registers have no
+       side effects from reading.  */
+    if (ra == 31) {
+        return;
+    }
+
+    /* The basic registers are data only, and unknown registers
+       are read-zero, write-ignore.  */
+    if (data == 0) {
+        tcg_gen_movi_i64(cpu_ir[ra], 0);
+    } else if (data & PR_BYTE) {
+        tcg_gen_ld8u_i64(cpu_ir[ra], cpu_env, data & ~PR_BYTE);
+    } else if (data & PR_LONG) {
+        tcg_gen_ld32s_i64(cpu_ir[ra], cpu_env, data & ~PR_LONG);
+    } else {
+        tcg_gen_ld_i64(cpu_ir[ra], cpu_env, data);
+    }
+}
+
+static void gen_mtpr(int rb, int regno)
+{
+    TCGv tmp;
+    int data;
+
+    if (rb == 31) {
+        tmp = tcg_const_i64(0);
+    } else {
+        tmp = cpu_ir[rb];
+    }
+
+    /* The basic registers are data only, and unknown registers
+       are read-zero, write-ignore.  */
+    data = cpu_pr_data(regno);
+    if (data != 0) {
+        if (data & PR_BYTE) {
+            tcg_gen_st8_i64(tmp, cpu_env, data & ~PR_BYTE);
+        } else if (data & PR_LONG) {
+            tcg_gen_st32_i64(tmp, cpu_env, data & ~PR_LONG);
+        } else {
+            tcg_gen_st_i64(tmp, cpu_env, data);
+        }
+    }
+
+    if (rb == 31) {
+        tcg_temp_free(tmp);
+    }
+}
+#endif /* !USER_ONLY*/
+
 static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
 {
     uint32_t palcode;
@@ -2576,7 +2659,7 @@ static ExitStatus translate_one(DisasContext *ctx, 
uint32_t insn)
 #else
         if (!ctx->pal_mode)
             goto invalid_opc;
-        tcg_abort();
+        gen_mfpr(ra, insn & 0xffff);
         break;
 #endif
     case 0x1A:
@@ -2852,7 +2935,7 @@ static ExitStatus translate_one(DisasContext *ctx, 
uint32_t insn)
 #else
         if (!ctx->pal_mode)
             goto invalid_opc;
-        abort();
+        gen_mtpr(rb, insn & 0xffff);
         break;
 #endif
     case 0x1E:
-- 
1.7.3.4