[Qemu-devel] [PATCH 1/2] target/arm: Move BE32 disassembler fixup

[Richard Henderson]

The Capstone disassembler has its own big-endian fixup.
Doing this twice does not work, of course.  Move our current
fixup from target/arm/cpu.c to disas/arm.c.

This makes read_memory_inner_func unused and can be removed.

Signed-off-by: Richard Henderson <address@hidden>
---
 include/disas/bfd.h |  7 -------
 disas/arm.c         | 21 ++++++++++++++++-----
 target/arm/cpu.c    | 19 -------------------
 3 files changed, 16 insertions(+), 31 deletions(-)

diff --git a/include/disas/bfd.h b/include/disas/bfd.h
index 9b0657cfa9..1f88c9e9d5 100644
--- a/include/disas/bfd.h
+++ b/include/disas/bfd.h
@@ -307,12 +307,6 @@ typedef struct disassemble_info {
     (bfd_vma memaddr, bfd_byte *myaddr, int length,
             struct disassemble_info *info);
 
-  /* A place to stash the real read_memory_func if read_memory_func wants to
-     do some funky address arithmetic or similar (e.g. for ARM BE32 mode).  */
-  int (*read_memory_inner_func)
-    (bfd_vma memaddr, bfd_byte *myaddr, int length,
-             struct disassemble_info *info);
-
   /* Function which should be called if we get an error that we can't
      recover from.  STATUS is the errno value from read_memory_func and
      MEMADDR is the address that we were trying to read.  INFO is a
@@ -483,7 +477,6 @@ int generic_symbol_at_address(bfd_vma, struct 
disassemble_info *);
   (INFO).buffer_vma = 0, \
   (INFO).buffer_length = 0, \
   (INFO).read_memory_func = buffer_read_memory, \
-  (INFO).read_memory_inner_func = NULL, \
   (INFO).memory_error_func = perror_memory, \
   (INFO).print_address_func = generic_print_address, \
   (INFO).print_insn = NULL, \
diff --git a/disas/arm.c b/disas/arm.c
index 27396dd3e1..9967c45990 100644
--- a/disas/arm.c
+++ b/disas/arm.c
@@ -70,6 +70,17 @@ static void floatformat_to_double (unsigned char *data, 
double *dest)
     *dest = u.f;
 }
 
+static int arm_read_memory(bfd_vma memaddr, bfd_byte *b, int length,
+                           struct disassemble_info *info)
+{
+    assert((info->flags & INSN_ARM_BE32) == 0 || length == 2 || length == 4);
+
+    if ((info->flags & INSN_ARM_BE32) != 0 && length == 2) {
+        memaddr ^= 2;
+    }
+    return info->read_memory_func(memaddr, b, length, info);
+}
+
 /* End of qemu specific additions.  */
 
 struct opcode32
@@ -3810,7 +3821,7 @@ find_ifthen_state (bfd_vma pc, struct disassemble_info 
*info,
          return;
        }
       addr -= 2;
-      status = info->read_memory_func (addr, (bfd_byte *)b, 2, info);
+      status = arm_read_memory (addr, (bfd_byte *)b, 2, info);
       if (status)
        return;
 
@@ -3882,7 +3893,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
       info->bytes_per_chunk = size;
       printer = print_insn_data;
 
-      status = info->read_memory_func (pc, (bfd_byte *)b, size, info);
+      status = arm_read_memory (pc, (bfd_byte *)b, size, info);
       given = 0;
       if (little)
        for (i = size - 1; i >= 0; i--)
@@ -3899,7 +3910,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
       info->bytes_per_chunk = 4;
       size = 4;
 
-      status = info->read_memory_func (pc, (bfd_byte *)b, 4, info);
+      status = arm_read_memory (pc, (bfd_byte *)b, 4, info);
       if (little)
        given = (b[0]) | (b[1] << 8) | (b[2] << 16) | ((unsigned)b[3] << 24);
       else
@@ -3915,7 +3926,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
       info->bytes_per_chunk = 2;
       size = 2;
 
-      status = info->read_memory_func (pc, (bfd_byte *)b, 2, info);
+      status = arm_read_memory (pc, (bfd_byte *)b, 2, info);
       if (little)
        given = (b[0]) | (b[1] << 8);
       else
@@ -3929,7 +3940,7 @@ print_insn_arm (bfd_vma pc, struct disassemble_info *info)
              || (given & 0xF800) == 0xF000
              || (given & 0xF800) == 0xE800)
            {
-             status = info->read_memory_func (pc + 2, (bfd_byte *)b, 2, info);
+             status = arm_read_memory (pc + 2, (bfd_byte *)b, 2, info);
              if (little)
                given = (b[0]) | (b[1] << 8) | (given << 16);
              else
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 1576a6d372..bc9d70df04 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -474,21 +474,6 @@ print_insn_thumb1(bfd_vma pc, disassemble_info *info)
   return print_insn_arm(pc | 1, info);
 }
 
-static int arm_read_memory_func(bfd_vma memaddr, bfd_byte *b,
-                                int length, struct disassemble_info *info)
-{
-    assert(info->read_memory_inner_func);
-    assert((info->flags & INSN_ARM_BE32) == 0 || length == 2 || length == 4);
-
-    if ((info->flags & INSN_ARM_BE32) != 0 && length == 2) {
-        assert(info->endian == BFD_ENDIAN_LITTLE);
-        return info->read_memory_inner_func(memaddr ^ 2, (bfd_byte *)b, 2,
-                                            info);
-    } else {
-        return info->read_memory_inner_func(memaddr, b, length, info);
-    }
-}
-
 static void arm_disas_set_info(CPUState *cpu, disassemble_info *info)
 {
     ARMCPU *ac = ARM_CPU(cpu);
@@ -528,10 +513,6 @@ static void arm_disas_set_info(CPUState *cpu, 
disassemble_info *info)
         info->endian = BFD_ENDIAN_BIG;
 #endif
     }
-    if (info->read_memory_inner_func == NULL) {
-        info->read_memory_inner_func = info->read_memory_func;
-        info->read_memory_func = arm_read_memory_func;
-    }
     info->flags &= ~INSN_ARM_BE32;
     if (arm_sctlr_b(env)) {
         info->flags |= INSN_ARM_BE32;
-- 
2.13.6