Merge remote-tracking branch 'remotes/xtensa/tags/20180316-xtensa' into staging

target/xtensa linux-user support.

- small cleanup for xtensa registers dumping (-d cpu);
- add support for debugging linux-user process with xtensa-linux-gdb
  (as opposed to xtensa-elf-gdb), which can only access unprivileged
  registers;
- enable MTTCG for target/xtensa;
- cleanup in linux-user/mmap area making sure that it works correctly
  with limited 30-bit-wide user address space;
- import xtensa-specific definitions from the linux kernel,
  conditionalize user-only/softmmu-only code and add handlers for
  signals, exceptions, process/thread creation and core registers dumping.

# gpg: Signature made Fri 16 Mar 2018 16:46:19 GMT
# gpg:                using RSA key 51F9CC91F83FA044
# gpg: Good signature from "Max Filippov <filippov@cadence.com>"
# gpg:                 aka "Max Filippov <max.filippov@cogentembedded.com>"
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>"
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* remotes/xtensa/tags/20180316-xtensa:
  MAINTAINERS: fix W: address for xtensa
  qemu-binfmt-conf.sh: add qemu-xtensa
  target/xtensa: add linux-user support
  linux-user: drop unused target_msync function
  linux-user: fix target_mprotect/target_munmap error return values
  linux-user: fix assertion in shmdt
  linux-user: fix mmap/munmap/mprotect/mremap/shmat
  target/xtensa: support MTTCG
  target/xtensa: use correct number of registers in gdbstub
  target/xtensa: mark register windows in the dump
  target/xtensa: dump correct physical registers

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

# Conflicts:
#	linux-user/syscall.c

1 files changed, 41 insertions, 9 deletions

diff --git a/target/xtensa/op_helper.c b/target/xtensa/op_helper.c
index 7486b99799..d401105d09 100644
--- a/target/xtensa/op_helper.c
+++ b/target/xtensa/op_helper.c
@@ -36,6 +36,13 @@
 #include "qemu/timer.h"
 #include "fpu/softfloat.h"
 
+#ifdef CONFIG_USER_ONLY
+/* tb_invalidate_phys_range */
+#include "accel/tcg/translate-all.h"
+#endif
+
+#ifndef CONFIG_USER_ONLY
+
 void xtensa_cpu_do_unaligned_access(CPUState *cs,
         vaddr addr, MMUAccessType access_type,
         int mmu_idx, uintptr_t retaddr)
@@ -102,6 +109,17 @@ static void tb_invalidate_virtual_addr(CPUXtensaState *env, uint32_t vaddr)
     }
 }
 
+#else
+
+static void tb_invalidate_virtual_addr(CPUXtensaState *env, uint32_t vaddr)
+{
+    mmap_lock();
+    tb_invalidate_phys_range(vaddr, vaddr + 1);
+    mmap_unlock();
+}
+
+#endif
+
 void HELPER(exception)(CPUXtensaState *env, uint32_t excp)
 {
     CPUState *cs = CPU(xtensa_env_get_cpu(env));
@@ -219,21 +237,21 @@ void xtensa_sync_phys_from_window(CPUXtensaState *env)
     copy_phys_from_window(env, env->sregs[WINDOW_BASE] * 4, 0, 16);
 }
 
-static void rotate_window_abs(CPUXtensaState *env, uint32_t position)
+static void xtensa_rotate_window_abs(CPUXtensaState *env, uint32_t position)
 {
     xtensa_sync_phys_from_window(env);
     env->sregs[WINDOW_BASE] = windowbase_bound(position, env);
     xtensa_sync_window_from_phys(env);
 }
 
-static void rotate_window(CPUXtensaState *env, uint32_t delta)
+void xtensa_rotate_window(CPUXtensaState *env, uint32_t delta)
 {
-    rotate_window_abs(env, env->sregs[WINDOW_BASE] + delta);
+    xtensa_rotate_window_abs(env, env->sregs[WINDOW_BASE] + delta);
 }
 
 void HELPER(wsr_windowbase)(CPUXtensaState *env, uint32_t v)
 {
-    rotate_window_abs(env, v);
+    xtensa_rotate_window_abs(env, v);
 }
 
 void HELPER(entry)(CPUXtensaState *env, uint32_t pc, uint32_t s, uint32_t imm)
@@ -251,7 +269,7 @@ void HELPER(entry)(CPUXtensaState *env, uint32_t pc, uint32_t s, uint32_t imm)
             HELPER(window_check)(env, pc, callinc);
         }
         env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - imm;
-        rotate_window(env, callinc);
+        xtensa_rotate_window(env, callinc);
         env->sregs[WINDOW_START] |=
             windowstart_bit(env->sregs[WINDOW_BASE], env);
     }
@@ -266,7 +284,7 @@ void HELPER(window_check)(CPUXtensaState *env, uint32_t pc, uint32_t w)
 
     assert(n <= w);
 
-    rotate_window(env, n);
+    xtensa_rotate_window(env, n);
     env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
         (windowbase << PS_OWB_SHIFT) | PS_EXCM;
     env->sregs[EPC1] = env->pc = pc;
@@ -311,7 +329,7 @@ uint32_t HELPER(retw)(CPUXtensaState *env, uint32_t pc)
 
         ret_pc = (pc & 0xc0000000) | (env->regs[0] & 0x3fffffff);
 
-        rotate_window(env, -n);
+        xtensa_rotate_window(env, -n);
         if (windowstart & windowstart_bit(env->sregs[WINDOW_BASE], env)) {
             env->sregs[WINDOW_START] &= ~windowstart_bit(owb, env);
         } else {
@@ -334,12 +352,17 @@ uint32_t HELPER(retw)(CPUXtensaState *env, uint32_t pc)
 
 void HELPER(rotw)(CPUXtensaState *env, uint32_t imm4)
 {
-    rotate_window(env, imm4);
+    xtensa_rotate_window(env, imm4);
+}
+
+void xtensa_restore_owb(CPUXtensaState *env)
+{
+    xtensa_rotate_window_abs(env, (env->sregs[PS] & PS_OWB) >> PS_OWB_SHIFT);
 }
 
 void HELPER(restore_owb)(CPUXtensaState *env)
 {
-    rotate_window_abs(env, (env->sregs[PS] & PS_OWB) >> PS_OWB_SHIFT);
+    xtensa_restore_owb(env);
 }
 
 void HELPER(movsp)(CPUXtensaState *env, uint32_t pc)
@@ -376,6 +399,8 @@ void HELPER(dump_state)(CPUXtensaState *env)
     cpu_dump_state(CPU(cpu), stderr, fprintf, 0);
 }
 
+#ifndef CONFIG_USER_ONLY
+
 void HELPER(waiti)(CPUXtensaState *env, uint32_t pc, uint32_t intlevel)
 {
     CPUState *cpu;
@@ -888,6 +913,7 @@ void HELPER(wsr_dbreakc)(CPUXtensaState *env, uint32_t i, uint32_t v)
     }
     env->sregs[DBREAKC + i] = v;
 }
+#endif
 
 void HELPER(wur_fcr)(CPUXtensaState *env, uint32_t v)
 {
@@ -1025,12 +1051,18 @@ void HELPER(ule_s)(CPUXtensaState *env, uint32_t br, float32 a, float32 b)
 
 uint32_t HELPER(rer)(CPUXtensaState *env, uint32_t addr)
 {
+#ifndef CONFIG_USER_ONLY
     return address_space_ldl(env->address_space_er, addr,
                              MEMTXATTRS_UNSPECIFIED, NULL);
+#else
+    return 0;
+#endif
 }
 
 void HELPER(wer)(CPUXtensaState *env, uint32_t data, uint32_t addr)
 {
+#ifndef CONFIG_USER_ONLY
     address_space_stl(env->address_space_er, addr, data,
                       MEMTXATTRS_UNSPECIFIED, NULL);
+#endif
 }