[Qemu-devel] [PATCH v19 05/21] target/rx: Disassemble rx_index_addr into a string

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

From: Richard Henderson <richard.henderson@linaro.org>

We were eliding all zero indexes.  It is only ld==0 that does
not have an index in the instruction.  This also allows us to
avoid breaking the final print into multiple pieces.

Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Message-Id: <20190607091116.49044-19-ysato@users.sourceforge.jp>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/rx/disas.c | 154 +++++++++++++++++-----------------------------
 1 file changed, 55 insertions(+), 99 deletions(-)

diff --git a/target/rx/disas.c b/target/rx/disas.c
index 8cada4825d..64342537ee 100644
--- a/target/rx/disas.c
+++ b/target/rx/disas.c
@@ -107,49 +107,42 @@ static const char psw[] = {
     'i', 'u', 0, 0, 0, 0, 0, 0,
 };
 
-static uint32_t rx_index_addr(int ld, int size, DisasContext *ctx)
+static void rx_index_addr(DisasContext *ctx, char out[8], int ld, int mi)
 {
-    bfd_byte buf[2];
+    uint32_t addr = ctx->addr;
+    uint8_t buf[2];
+    uint16_t dsp;
+
     switch (ld) {
     case 0:
-        return 0;
+        /* No index; return empty string.  */
+        out[0] = '\0';
+        return;
     case 1:
-        ctx->dis->read_memory_func(ctx->addr, buf, 1, ctx->dis);
         ctx->addr += 1;
-        return ((uint8_t)buf[0]) << size;
+        ctx->dis->read_memory_func(addr, buf, 1, ctx->dis);
+        dsp = buf[0];
+        break;
     case 2:
-        ctx->dis->read_memory_func(ctx->addr, buf, 2, ctx->dis);
         ctx->addr += 2;
-        return lduw_le_p(buf) << size;
+        ctx->dis->read_memory_func(addr, buf, 2, ctx->dis);
+        dsp = lduw_le_p(buf);
+        break;
+    default:
+        g_assert_not_reached();
     }
-    g_assert_not_reached();
+
+    sprintf(out, "%u", dsp << (mi < 3 ? mi : 4 - mi));
 }
 
 static void operand(DisasContext *ctx, int ld, int mi, int rs, int rd)
 {
-    int dsp;
     static const char sizes[][4] = {".b", ".w", ".l", ".uw", ".ub"};
+    char dsp[8];
+
     if (ld < 3) {
-        switch (mi) {
-        case 4:
-            /* dsp[rs].ub */
-            dsp = rx_index_addr(ld, RX_MEMORY_BYTE, ctx);
-            break;
-        case 3:
-            /* dsp[rs].uw */
-            dsp = rx_index_addr(ld, RX_MEMORY_WORD, ctx);
-            break;
-        default:
-            /* dsp[rs].b */
-            /* dsp[rs].w */
-            /* dsp[rs].l */
-            dsp = rx_index_addr(ld, mi, ctx);
-            break;
-        }
-        if (dsp > 0) {
-            prt("%d", dsp);
-        }
-        prt("[r%d]%s", rs, sizes[mi]);
+        rx_index_addr(ctx, dsp, ld, mi);
+        prt("%s[r%d]%s", dsp, rs, sizes[mi]);
     } else {
         prt("r%d", rs);
     }
@@ -235,7 +228,7 @@ static bool trans_MOV_ra(DisasContext *ctx, arg_MOV_ra *a)
 /* mov.[bwl] rs,rd */
 static bool trans_MOV_mm(DisasContext *ctx, arg_MOV_mm *a)
 {
-    int dsp;
+    char dspd[8], dsps[8];
 
     prt("mov.%c\t", size[a->sz]);
     if (a->lds == 3 && a->ldd == 3) {
@@ -244,29 +237,15 @@ static bool trans_MOV_mm(DisasContext *ctx, arg_MOV_mm *a)
         return true;
     }
     if (a->lds == 3) {
-        prt("r%d, ", a->rd);
-        dsp = rx_index_addr(a->ldd, a->sz, ctx);
-        if (dsp > 0) {
-            prt("%d", dsp);
-        }
-        prt("[r%d]", a->rs);
+        rx_index_addr(ctx, dspd, a->ldd, a->sz);
+        prt("r%d, %s[r%d]", a->rs, dspd, a->rd);
     } else if (a->ldd == 3) {
-        dsp = rx_index_addr(a->lds, a->sz, ctx);
-        if (dsp > 0) {
-            prt("%d", dsp);
-        }
-        prt("[r%d], r%d", a->rs, a->rd);
+        rx_index_addr(ctx, dsps, a->lds, a->sz);
+        prt("%s[r%d], r%d", dsps, a->rs, a->rd);
     } else {
-        dsp = rx_index_addr(a->lds, a->sz, ctx);
-        if (dsp > 0) {
-            prt("%d", dsp);
-        }
-        prt("[r%d], ", a->rs);
-        dsp = rx_index_addr(a->ldd, a->sz, ctx);
-        if (dsp > 0) {
-            prt("%d", dsp);
-        }
-        prt("[r%d]", a->rd);
+        rx_index_addr(ctx, dsps, a->lds, a->sz);
+        rx_index_addr(ctx, dspd, a->ldd, a->sz);
+        prt("%s[r%d], %s[r%d]", dsps, a->rs, dspd, a->rd);
     }
     return true;
 }
@@ -357,12 +336,10 @@ static bool trans_PUSH_r(DisasContext *ctx, arg_PUSH_r *a)
 /* push dsp[rs] */
 static bool trans_PUSH_m(DisasContext *ctx, arg_PUSH_m *a)
 {
-    prt("push\t");
-    int dsp = rx_index_addr(a->ld, a->sz, ctx);
-    if (dsp > 0) {
-        prt("%d", dsp);
-    }
-    prt("[r%d]", a->rs);
+    char dsp[8];
+
+    rx_index_addr(ctx, dsp, a->ld, a->sz);
+    prt("push\t%s[r%d]", dsp, a->rs);
     return true;
 }
 
@@ -389,17 +366,13 @@ static bool trans_XCHG_rr(DisasContext *ctx, arg_XCHG_rr *a)
 /* xchg dsp[rs].<mi>,rd */
 static bool trans_XCHG_mr(DisasContext *ctx, arg_XCHG_mr *a)
 {
-    int dsp;
     static const char msize[][4] = {
         "b", "w", "l", "ub", "uw",
     };
+    char dsp[8];
 
-    prt("xchg\t");
-    dsp = rx_index_addr(a->ld, a->mi, ctx);
-    if (dsp > 0) {
-        prt("%d", dsp);
-    }
-    prt("[r%d].%s, r%d", a->rs, msize[a->mi], a->rd);
+    rx_index_addr(ctx, dsp, a->ld, a->mi);
+    prt("xchg\t%s[r%d].%s, r%d", dsp, a->rs, msize[a->mi], a->rd);
     return true;
 }
 
@@ -552,13 +525,10 @@ static bool trans_ADC_rr(DisasContext *ctx, arg_ADC_rr *a)
 /* adc dsp[rs], rd */
 static bool trans_ADC_mr(DisasContext *ctx, arg_ADC_mr *a)
 {
-    int dsp;
-    prt("adc\t");
-    dsp = rx_index_addr(a->ld, 2, ctx);
-    if (dsp > 0) {
-        prt("%d", dsp);
-    }
-    prt("[r%d], r%d", a->rs, a->rd);
+    char dsp[8];
+
+    rx_index_addr(ctx, dsp, a->ld, 2);
+    prt("adc\t%s[r%d], r%d", dsp, a->rs, a->rd);
     return true;
 }
 
@@ -1217,25 +1187,17 @@ static bool trans_ITOF(DisasContext *ctx, arg_ITOF *a)
 
 #define BOP_IM(name, reg)                                       \
     do {                                                        \
-        int dsp;                                                \
-        prt("b%s\t#%d, ", #name, a->imm);                       \
-        dsp = rx_index_addr(a->ld, RX_MEMORY_BYTE, ctx);        \
-        if (dsp > 0) {                                          \
-            prt("%d", dsp);                                     \
-        }                                                       \
-        prt("[r%d]", reg);                                      \
+        char dsp[8];                                            \
+        rx_index_addr(ctx, dsp, a->ld, RX_MEMORY_BYTE);         \
+        prt("b%s\t#%d, %s[r%d]", #name, a->imm, dsp, reg);      \
         return true;                                            \
     } while (0)
 
 #define BOP_RM(name)                                            \
     do {                                                        \
-        int dsp;                                                \
-        prt("b%s\tr%d, ", #name, a->rd);                        \
-        dsp = rx_index_addr(a->ld, RX_MEMORY_BYTE, ctx);        \
-        if (dsp > 0) {                                          \
-            prt("%d", dsp);                                     \
-        }                                                       \
-        prt("[r%d]", a->rs);                                    \
+        char dsp[8];                                            \
+        rx_index_addr(ctx, dsp, a->ld, RX_MEMORY_BYTE);         \
+        prt("b%s\tr%d, %s[r%d]", #name, a->rd, dsp, a->rs);     \
         return true;                                            \
     } while (0)
 
@@ -1346,12 +1308,10 @@ static bool trans_BNOT_ir(DisasContext *ctx, arg_BNOT_ir *a)
 /* bmcond #imm, dsp[rd] */
 static bool trans_BMCnd_im(DisasContext *ctx, arg_BMCnd_im *a)
 {
-    int dsp = rx_index_addr(a->ld, RX_MEMORY_BYTE, ctx);
-    prt("bm%s\t#%d, ", cond[a->cd], a->imm);
-    if (dsp > 0) {
-        prt("%d", dsp);
-    }
-    prt("[%d]", a->rd);
+    char dsp[8];
+
+    rx_index_addr(ctx, dsp, a->ld, RX_MEMORY_BYTE);
+    prt("bm%s\t#%d, %s[r%d]", cond[a->cd], a->imm, dsp, a->rd);
     return true;
 }
 
@@ -1443,16 +1403,12 @@ static bool trans_WAIT(DisasContext *ctx, arg_WAIT *a)
 /* sccnd.[bwl] dsp:[rd] */
 static bool trans_SCCnd(DisasContext *ctx, arg_SCCnd *a)
 {
-    int dsp;
-    prt("sc%s.%c\t", cond[a->cd], size[a->sz]);
     if (a->ld < 3) {
-        dsp = rx_index_addr(a->sz, a->ld, ctx);
-        if (dsp > 0) {
-            prt("%d", dsp);
-        }
-        prt("[r%d]", a->rd);
+        char dsp[8];
+        rx_index_addr(ctx, dsp, a->sz, a->ld);
+        prt("sc%s.%c\t%s[r%d]", cond[a->cd], size[a->sz], dsp, a->rd);
     } else {
-        prt("r%d", a->rd);
+        prt("sc%s.%c\tr%d", cond[a->cd], size[a->sz], a->rd);
     }
     return true;
 }
-- 
2.20.1