[Qemu-devel] [RFC 15/28] target-xtensa: big endian support

[Max Filippov <jcmvbkbc@gmail.com>]

Big endian opcode decoding is slightly different.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 configure                 |    7 ++++---
 hw/xtensa_sample.c        |    6 +++++-
 target-xtensa/translate.c |   31 +++++++++++++++++++++++++++++--
 3 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/configure b/configure
index 41a7007..c45c2a3 100755
--- a/configure
+++ b/configure
@@ -1029,6 +1029,7 @@ sh4eb-softmmu \
 sparc-softmmu \
 sparc64-softmmu \
 xtensa-softmmu \
+xtensaeb-softmmu \
 "
     fi
 # the following are Linux specific
@@ -3016,7 +3017,7 @@ target_arch2=`echo $target | cut -d '-' -f 1`
 target_bigendian="no"
 
 case "$target_arch2" in
-  armeb|lm32|m68k|microblaze|mips|mipsn32|mips64|ppc|ppcemb|ppc64|ppc64abi32|s390x|sh4eb|sparc|sparc64|sparc32plus)
+  armeb|lm32|m68k|microblaze|mips|mipsn32|mips64|ppc|ppcemb|ppc64|ppc64abi32|s390x|sh4eb|sparc|sparc64|sparc32plus|xtensaeb)
   target_bigendian=yes
   ;;
 esac
@@ -3211,7 +3212,7 @@ case "$target_arch2" in
   unicore32)
     target_phys_bits=32
   ;;
-  xtensa)
+  xtensa|xtensaeb)
     TARGET_ARCH=xtensa
     gdb_xml_files="xtensa-core.xml"
     target_phys_bits=32
@@ -3391,7 +3392,7 @@ for i in $ARCH $TARGET_BASE_ARCH ; do
     echo "CONFIG_SPARC_DIS=y"  >> $config_target_mak
     echo "CONFIG_SPARC_DIS=y"  >> $libdis_config_mak
   ;;
-  xtensa)
+  xtensa*)
     echo "CONFIG_XTENSA_DIS=y"  >> $config_target_mak
     echo "CONFIG_XTENSA_DIS=y"  >> $libdis_config_mak
   ;;
diff --git a/hw/xtensa_sample.c b/hw/xtensa_sample.c
index 8103675..b1da7e1 100644
--- a/hw/xtensa_sample.c
+++ b/hw/xtensa_sample.c
@@ -32,9 +32,13 @@ static void xtensa_init(ram_addr_t ram_size,
     if (kernel_filename) {
         uint64_t elf_entry;
         uint64_t elf_lowaddr;
-
+#ifdef TARGET_WORDS_BIGENDIAN
+        int success = load_elf(kernel_filename, NULL, NULL, &elf_entry,
+                &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);
+#else
         int success = load_elf(kernel_filename, NULL, NULL, &elf_entry,
                 &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
+#endif
         if (success > 0) {
             env->pc = elf_entry;
         }
diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
index a47efb0..da3120f 100644
--- a/target-xtensa/translate.c
+++ b/target-xtensa/translate.c
@@ -170,12 +170,21 @@ static void disas_xtensa_insn(DisasContext *dc)
     } while (0)
 
 
+#ifdef TARGET_WORDS_BIGENDIAN
 #define _OP0 (((_b0) & 0xf0) >> 4)
 #define _OP1 (((_b2) & 0xf0) >> 4)
 #define _OP2 ((_b2) & 0xf)
 #define RRR_R ((_b1) & 0xf)
 #define RRR_S (((_b1) & 0xf0) >> 4)
 #define RRR_T ((_b0) & 0xf)
+#else
+#define _OP0 (((_b0) & 0xf))
+#define _OP1 (((_b2) & 0xf))
+#define _OP2 (((_b2) & 0xf0) >> 4)
+#define RRR_R (((_b1) & 0xf0) >> 4)
+#define RRR_S (((_b1) & 0xf))
+#define RRR_T (((_b0) & 0xf0) >> 4)
+#endif
 
 #define RRRN_R RRR_R
 #define RRRN_S RRR_S
@@ -187,20 +196,38 @@ static void disas_xtensa_insn(DisasContext *dc)
 #define RRI8_IMM8 (_b2)
 #define RRI8_IMM8_SE ((((_b2) & 0x80) ? 0xffffff00 : 0) | RRI8_IMM8)
 
+#ifdef TARGET_WORDS_BIGENDIAN
 #define RI16_IMM16 (((_b1) << 8) | (_b2))
+#else
+#define RI16_IMM16 (((_b2) << 8) | (_b1))
+#endif
 
+#ifdef TARGET_WORDS_BIGENDIAN
 #define CALL_N (((_b0) & 0xc) >> 2)
 #define CALL_OFFSET ((((_b0) & 0x3) << 16) | ((_b1) << 8) | (_b2))
-#define CALL_OFFSET_SE (((_b0 & 0x2) ? 0xfffc0000 : 0) | CALL_OFFSET)
+#else
+#define CALL_N (((_b0) & 0x30) >> 4)
+#define CALL_OFFSET ((((_b0) & 0xc0) >> 6) | ((_b1) << 2) | ((_b2) << 10))
+#endif
+#define CALL_OFFSET_SE \
+    (((CALL_OFFSET & 0x20000) ? 0xfffc0000 : 0) | CALL_OFFSET)
 
 #define CALLX_N CALL_N
+#ifdef TARGET_WORDS_BIGENDIAN
 #define CALLX_M ((_b0) & 0x3)
+#else
+#define CALLX_M (((_b0) & 0xc0) >> 6)
+#endif
 #define CALLX_S RRR_S
 
 #define BRI12_M CALLX_M
 #define BRI12_S RRR_S
+#ifdef TARGET_WORDS_BIGENDIAN
 #define BRI12_IMM12 ((((_b1) & 0xf) << 8) | (_b2))
-#define BRI12_IMM12_SE ((((_b1) & 0x8) ? 0xfffff000 : 0) | BRI12_IMM12)
+#else
+#define BRI12_IMM12 ((((_b1) & 0xf0) >> 4) | ((_b2) << 4))
+#endif
+#define BRI12_IMM12_SE (((BRI12_IMM12 & 0x800) ? 0xfffff000 : 0) | BRI12_IMM12)
 
 #define BRI8_M BRI12_M
 #define BRI8_R RRI8_R
-- 
1.7.3.4