Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20181226' into staging

Host support for riscv64.
Dead code elimination pass.
Register allocation improvements.

# gpg: Signature made Tue 25 Dec 2018 20:52:34 GMT
# gpg:                using RSA key 64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20181226: (42 commits)
  tcg: Improve call argument loading
  tcg: Record register preferences during liveness
  tcg: Add TCG_OPF_BB_EXIT
  tcg: Split out more subroutines from liveness_pass_1
  tcg: Rename and adjust liveness_pass_1 helpers
  tcg: Reindent parts of liveness_pass_1
  tcg: Dump register preference info with liveness
  tcg: Improve register allocation for matching constraints
  tcg: Add output_pref to TCGOp
  tcg: Add preferred_reg argument to tcg_reg_alloc_do_movi
  tcg: Add preferred_reg argument to temp_sync
  tcg: Add preferred_reg argument to temp_load
  tcg: Add preferred_reg argument to tcg_reg_alloc
  tcg: Add reachable_code_pass
  tcg: Reference count labels
  tcg: Add TCG_CALL_NO_RETURN
  tcg: Renumber TCG_CALL_* flags
  linux-user: Add safe_syscall for riscv64 host
  disas/microblaze: Remove unused REG_SP macro
  configure: Add support for building RISC-V host
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

4 files changed, 83 insertions, 7 deletions

diff --git a/include/elf.h b/include/elf.h
index c151164b63..0ac7911b7b 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -1338,6 +1338,61 @@ typedef struct {
 #define R_IA64_DTPREL64LSB	0xb7	/* @dtprel(sym + add), data8 LSB */
 #define R_IA64_LTOFF_DTPREL22	0xba	/* @ltoff(@dtprel(s+a)), imm22 */
 
+/* RISC-V relocations.  */
+#define R_RISCV_NONE          0
+#define R_RISCV_32            1
+#define R_RISCV_64            2
+#define R_RISCV_RELATIVE      3
+#define R_RISCV_COPY          4
+#define R_RISCV_JUMP_SLOT     5
+#define R_RISCV_TLS_DTPMOD32  6
+#define R_RISCV_TLS_DTPMOD64  7
+#define R_RISCV_TLS_DTPREL32  8
+#define R_RISCV_TLS_DTPREL64  9
+#define R_RISCV_TLS_TPREL32   10
+#define R_RISCV_TLS_TPREL64   11
+#define R_RISCV_BRANCH        16
+#define R_RISCV_JAL           17
+#define R_RISCV_CALL          18
+#define R_RISCV_CALL_PLT      19
+#define R_RISCV_GOT_HI20      20
+#define R_RISCV_TLS_GOT_HI20  21
+#define R_RISCV_TLS_GD_HI20   22
+#define R_RISCV_PCREL_HI20    23
+#define R_RISCV_PCREL_LO12_I  24
+#define R_RISCV_PCREL_LO12_S  25
+#define R_RISCV_HI20          26
+#define R_RISCV_LO12_I        27
+#define R_RISCV_LO12_S        28
+#define R_RISCV_TPREL_HI20    29
+#define R_RISCV_TPREL_LO12_I  30
+#define R_RISCV_TPREL_LO12_S  31
+#define R_RISCV_TPREL_ADD     32
+#define R_RISCV_ADD8          33
+#define R_RISCV_ADD16         34
+#define R_RISCV_ADD32         35
+#define R_RISCV_ADD64         36
+#define R_RISCV_SUB8          37
+#define R_RISCV_SUB16         38
+#define R_RISCV_SUB32         39
+#define R_RISCV_SUB64         40
+#define R_RISCV_GNU_VTINHERIT 41
+#define R_RISCV_GNU_VTENTRY   42
+#define R_RISCV_ALIGN         43
+#define R_RISCV_RVC_BRANCH    44
+#define R_RISCV_RVC_JUMP      45
+#define R_RISCV_RVC_LUI       46
+#define R_RISCV_GPREL_I       47
+#define R_RISCV_GPREL_S       48
+#define R_RISCV_TPREL_I       49
+#define R_RISCV_TPREL_S       50
+#define R_RISCV_RELAX         51
+#define R_RISCV_SUB6          52
+#define R_RISCV_SET6          53
+#define R_RISCV_SET8          54
+#define R_RISCV_SET16         55
+#define R_RISCV_SET32         56
+
 typedef struct elf32_rel {
   Elf32_Addr	r_offset;
   Elf32_Word	r_info;
diff --git a/include/exec/helper-head.h b/include/exec/helper-head.h
index 276dd5afce..ab4f8b6623 100644
--- a/include/exec/helper-head.h
+++ b/include/exec/helper-head.h
@@ -108,6 +108,19 @@
 #define dh_is_signed_env dh_is_signed_ptr
 #define dh_is_signed(t) dh_is_signed_##t
 
+#define dh_callflag_i32  0
+#define dh_callflag_s32  0
+#define dh_callflag_int  0
+#define dh_callflag_i64  0
+#define dh_callflag_s64  0
+#define dh_callflag_f16  0
+#define dh_callflag_f32  0
+#define dh_callflag_f64  0
+#define dh_callflag_ptr  0
+#define dh_callflag_void 0
+#define dh_callflag_noreturn TCG_CALL_NO_RETURN
+#define dh_callflag(t) glue(dh_callflag_, dh_alias(t))
+
 #define dh_sizemask(t, n) \
   ((dh_is_64bit(t) << (n*2)) | (dh_is_signed(t) << (n*2+1)))
 
diff --git a/include/exec/helper-tcg.h b/include/exec/helper-tcg.h
index b3bdb0c399..268e0f804b 100644
--- a/include/exec/helper-tcg.h
+++ b/include/exec/helper-tcg.h
@@ -11,36 +11,43 @@
 #define str(s) #s
 
 #define DEF_HELPER_FLAGS_0(NAME, FLAGS, ret) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) },
 
 #define DEF_HELPER_FLAGS_1(NAME, FLAGS, ret, t1) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) | dh_sizemask(t1, 1) },
 
 #define DEF_HELPER_FLAGS_2(NAME, FLAGS, ret, t1, t2) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) | dh_sizemask(t1, 1) \
     | dh_sizemask(t2, 2) },
 
 #define DEF_HELPER_FLAGS_3(NAME, FLAGS, ret, t1, t2, t3) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) | dh_sizemask(t1, 1) \
     | dh_sizemask(t2, 2) | dh_sizemask(t3, 3) },
 
 #define DEF_HELPER_FLAGS_4(NAME, FLAGS, ret, t1, t2, t3, t4) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) | dh_sizemask(t1, 1) \
     | dh_sizemask(t2, 2) | dh_sizemask(t3, 3) | dh_sizemask(t4, 4) },
 
 #define DEF_HELPER_FLAGS_5(NAME, FLAGS, ret, t1, t2, t3, t4, t5) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) | dh_sizemask(t1, 1) \
     | dh_sizemask(t2, 2) | dh_sizemask(t3, 3) | dh_sizemask(t4, 4) \
     | dh_sizemask(t5, 5) },
 
 #define DEF_HELPER_FLAGS_6(NAME, FLAGS, ret, t1, t2, t3, t4, t5, t6) \
-  { .func = HELPER(NAME), .name = str(NAME), .flags = FLAGS, \
+  { .func = HELPER(NAME), .name = str(NAME), \
+    .flags = FLAGS | dh_callflag(ret), \
     .sizemask = dh_sizemask(ret, 0) | dh_sizemask(t1, 1) \
     | dh_sizemask(t2, 2) | dh_sizemask(t3, 3) | dh_sizemask(t4, 4) \
     | dh_sizemask(t5, 5) | dh_sizemask(t6, 6) },
diff --git a/include/exec/poison.h b/include/exec/poison.h
index 32d53789f8..ecdc83c147 100644
--- a/include/exec/poison.h
+++ b/include/exec/poison.h
@@ -79,6 +79,7 @@
 #pragma GCC poison CONFIG_MOXIE_DIS
 #pragma GCC poison CONFIG_NIOS2_DIS
 #pragma GCC poison CONFIG_PPC_DIS
+#pragma GCC poison CONFIG_RISCV_DIS
 #pragma GCC poison CONFIG_S390_DIS
 #pragma GCC poison CONFIG_SH4_DIS
 #pragma GCC poison CONFIG_SPARC_DIS