[1/3] linux-user:Support for MIPS64 user mode emulation in QEMU
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Message ID BANLkTikOwCW-M6nAr6zAxx7-3Q-vg2FR5w@mail.gmail.com
State New
Headers show

Commit Message

Khansa Butt April 29, 2011, 6:12 a.m. 
From fbd2b81503b1f55368b83903ded723f60de8aea7 Mon Sep 17 00:00:00 2001
From: Ehsan-ul-Haq, Abdul Qadeer, Abdul Waheed, Khansa Butt <
khansa@kics.edu.pk>
Date: Fri, 29 Apr 2011 11:17:56 +0500
Subject: [PATCH 1/3] linux-user:Support for MIPS64 user mode emulation in
QEMU


Signed-off-by: Khansa Butt <khansa@kics.edu.pk>
---
 configure                    |    1 +
 linux-user/main.c            |   26 +++++++++++++++++++++++++-
 linux-user/mips64/syscall.h  |    3 +++
 linux-user/signal.c          |    2 --
 linux-user/syscall.c         |    5 +++++
 target-mips/mips-defs.h      |    2 ++
 target-mips/translate.c      |    1 +
 target-mips/translate_init.c |   26 ++++++++++++++++++++++++++
 8 files changed, 63 insertions(+), 3 deletions(-)

+    {
         .name = "Loongson-2E",
         .CP0_PRid = 0x6302,
         /*64KB I-cache and d-cache. 4 way with 32 bit cache line size*/

Patch
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diff --git a/configure b/configure
index de44bac..631417b 100755
--- a/configure
+++ b/configure
@@ -1043,6 +1043,7 @@  m68k-linux-user \
 microblaze-linux-user \
 microblazeel-linux-user \
 mips-linux-user \
+mips64-linux-user \
 mipsel-linux-user \
 ppc-linux-user \
 ppc64-linux-user \
diff --git a/linux-user/main.c b/linux-user/main.c
index a1e37e4..253e796 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2014,6 +2014,14 @@  static int do_store_exclusive(CPUMIPSState *env)
     int d;

     addr = env->lladdr;
+#if defined(TARGET_MIPS64)
+/* For MIPS64 on 32 bit host there is a need to make
+* the page accessible to which the above 'addr' is belonged */
+#if HOST_LONG_BITS == 32
+    int flag = PAGE_VALID | PAGE_READ | PAGE_WRITE | PAGE_WRITE_ORG;
+    page_set_flags(addr, addr + 4096, flag);
+#endif
+#endif
     page_addr = addr & TARGET_PAGE_MASK;
     start_exclusive();
     mmap_lock();
@@ -2055,7 +2063,8 @@  static int do_store_exclusive(CPUMIPSState *env)
 void cpu_loop(CPUMIPSState *env)
 {
     target_siginfo_t info;
-    int trapnr, ret;
+    int trapnr;
+    abi_long ret;
     unsigned int syscall_num;

     for(;;) {
@@ -2064,6 +2073,20 @@  void cpu_loop(CPUMIPSState *env)
         cpu_exec_end(env);
         switch(trapnr) {
         case EXCP_SYSCALL:
+#if defined(TARGET_MIPS64)
+            syscall_num = env->active_tc.gpr[2] - 5000;
+            env->active_tc.PC += 4;
+            /* MIPS64 has eight argument registers so there is
+             * no need to get arguments from stack
+             */
+            ret = do_syscall(env, env->active_tc.gpr[2],
+                             env->active_tc.gpr[4],
+                             env->active_tc.gpr[5],
+                             env->active_tc.gpr[6],
+                             env->active_tc.gpr[7],
+                             env->active_tc.gpr[8],
+                             env->active_tc.gpr[9]);
+#else
             syscall_num = env->active_tc.gpr[2] - 4000;
             env->active_tc.PC += 4;
             if (syscall_num >= sizeof(mips_syscall_args)) {
@@ -2092,6 +2115,7 @@  void cpu_loop(CPUMIPSState *env)
                                  env->active_tc.gpr[7],
                                  arg5, arg6/*, arg7, arg8*/);
             }
+#endif
             if (ret == -TARGET_QEMU_ESIGRETURN) {
                 /* Returning from a successful sigreturn syscall.
                    Avoid clobbering register state.  */
diff --git a/linux-user/mips64/syscall.h b/linux-user/mips64/syscall.h
index 668a2b9..ec65653 100644
--- a/linux-user/mips64/syscall.h
+++ b/linux-user/mips64/syscall.h
@@ -218,4 +218,7 @@  struct target_pt_regs {



+/* Nasty hack: define a fake errno value for use by sigreturn.  */
+#define TARGET_QEMU_ESIGRETURN 255
+
 #define UNAME_MACHINE "mips64"
diff --git a/linux-user/signal.c b/linux-user/signal.c
index ce033e9..66786db 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -2413,8 +2413,6 @@  void sparc64_get_context(CPUSPARCState *env)
 #endif
 #elif defined(TARGET_ABI_MIPSN64)

-# warning signal handling not implemented
-
 static void setup_frame(int sig, struct target_sigaction *ka,
  target_sigset_t *set, CPUState *env)
 {
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index bb0999d..cfa925e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7320,6 +7320,11 @@  abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
     case TARGET_NR_set_thread_area:
 #if defined(TARGET_MIPS)
       ((CPUMIPSState *) cpu_env)->tls_value = arg1;
+      if (((CPUMIPSState *) cpu_env)->insn_flags & CPU_OCTEON) {
+          /* tls entry is moved to k0 so that this can be used later
+             currently this thing is tested only for Octeon */
+          ((CPUMIPSState *) cpu_env)->active_tc.gpr[26] = arg1;
+      }
       ret = 0;
       break;
 #elif defined(TARGET_CRIS)
diff --git a/target-mips/mips-defs.h b/target-mips/mips-defs.h
index bf094a3..a93e863 100644
--- a/target-mips/mips-defs.h
+++ b/target-mips/mips-defs.h
@@ -44,6 +44,7 @@ 
 #define INSN_LOONGSON2E  0x20000000
 #define INSN_LOONGSON2F  0x40000000
 #define INSN_VR54XX 0x80000000
+#define INSN_OCTEON 0x10000000

 /* MIPS CPU defines. */
 #define CPU_MIPS1 (ISA_MIPS1)
@@ -53,6 +54,7 @@ 
 #define CPU_VR54XX (CPU_MIPS4 | INSN_VR54XX)
 #define CPU_LOONGSON2E  (CPU_MIPS3 | INSN_LOONGSON2E)
 #define CPU_LOONGSON2F  (CPU_MIPS3 | INSN_LOONGSON2F)
+#define CPU_OCTEON      (CPU_MIPS64R2 | INSN_OCTEON)

 #define CPU_MIPS5 (CPU_MIPS4 | ISA_MIPS5)

diff --git a/target-mips/translate.c b/target-mips/translate.c
index 4eaa826..c88c3f9 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -12694,6 +12694,7 @@  void cpu_reset (CPUMIPSState *env)
         env->hflags |= MIPS_HFLAG_FPU;
     }
 #ifdef TARGET_MIPS64
+    env->hflags |=  MIPS_HFLAG_UX;
     if (env->active_fpu.fcr0 & (1 << FCR0_F64)) {
         env->hflags |= MIPS_HFLAG_F64;
     }
diff --git a/target-mips/translate_init.c b/target-mips/translate_init.c
index 590e092..6a18995 100644
--- a/target-mips/translate_init.c
+++ b/target-mips/translate_init.c
@@ -451,6 +451,32 @@  static const mips_def_t mips_defs[] =
         .mmu_type = MMU_TYPE_R4000,
     },
     {
+        /* XXX: We will add some more features related to
+           Octeon's coprocessors */
+        .name = "octeon",
+        .CP0_PRid = 0x0d30,
+        .CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR) | (0x2 << CP0C0_AT)
|
+                       (MMU_TYPE_R4000 << CP0C0_MT),
+        .CP0_Config1 = MIPS_CONFIG1 | (63 << CP0C1_MMU) |
+                       (2 << CP0C1_IS) | (4 << CP0C1_IL) | (3 << CP0C1_IA)
|
+                       (2 << CP0C1_DS) | (4 << CP0C1_DL) | (3 << CP0C1_DA)
|
+                       (1 << CP0C1_PC) | (1 << CP0C1_WR) | (1 << CP0C1_EP),
+         .CP0_Config2 = MIPS_CONFIG2,
+         .CP0_Config3 = MIPS_CONFIG3 | (1 << CP0C3_LPA),
+         .CP0_LLAddr_rw_bitmask = 0,
+         .CP0_LLAddr_shift = 0,
+         .SYNCI_Step = 32,
+         .CCRes = 2,
+         .CP0_Status_rw_bitmask = 0x36FBFFFF,
+         .CP1_fcr0 = (1 << FCR0_F64) | (1 << FCR0_3D) | (1 << FCR0_PS) |
+                     (1 << FCR0_L) | (1 << FCR0_W) | (1 << FCR0_D) |
+                     (1 << FCR0_S) | (0x00 << FCR0_PRID) | (0x0 <<
FCR0_REV),
+         .SEGBITS = 49,
+         .PABITS = 49,
+         .insn_flags = CPU_OCTEON | ASE_MIPS3D,
+         .mmu_type = MMU_TYPE_R4000,
+    },