linux-unwind.h (_sig_ucontext_t): Remove.

2018-11-13  Xianmiao Qu  <xianmiao_qu@c-sky.com>

	libgcc/
	* config/csky/linux-unwind.h (_sig_ucontext_t): Remove.
	(csky_fallback_frame_state): Modify the check of the 
	instructions to adapt to changes in the kernel

From-SVN: r266060

2 files changed, 58 insertions, 53 deletions

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index cba3244..5232118 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,9 @@
+2018-11-13  Xianmiao Qu  <xianmiao_qu@c-sky.com>
+
+	* config/csky/linux-unwind.h (_sig_ucontext_t): Remove.
+	(csky_fallback_frame_state): Modify the check of the 
+	instructions to adapt to changes in the kernel
+
 2018-11-09  Stafford Horne  <shorne@gmail.com>
 	    Richard Henderson  <rth@twiddle.net>
 
diff --git a/libgcc/config/csky/linux-unwind.h b/libgcc/config/csky/linux-unwind.h
index 24638de..25e4e6c 100644
--- a/libgcc/config/csky/linux-unwind.h
+++ b/libgcc/config/csky/linux-unwind.h
@@ -25,22 +25,33 @@
 
 #ifndef inhibit_libc
 
-/* Do code reading to identify a signal frame, and set the frame
-   state data appropriately.  See unwind-dw2.c for the structs.  */
+/*
+ * Do code reading to identify a signal frame, and set the frame state data
+ * appropriately.  See unwind-dw2.c for the structs.
+ */
 
 #include <signal.h>
 #include <asm/unistd.h>
 
-/* The third parameter to the signal handler points to something with
-   this structure defined in asm/ucontext.h, but the name clashes with
-   struct ucontext from sys/ucontext.h so this private copy is used.  */
-typedef struct _sig_ucontext {
-  unsigned long         uc_flags;
-  struct _sig_ucontext  *uc_link;
-  stack_t               uc_stack;
-  struct sigcontext     uc_mcontext;
-  sigset_t              uc_sigmask;
-} _sig_ucontext_t;
+#define TRAP0_V1 0x0008
+#define MOVI_R1_119_V1 (0x6000 + (119 << 4) + 1)
+#define MOVI_R1_127_V1 (0x6000 + (127 << 4) + 1)
+#define ADDI_R1_32_V1 (0x2000 + (31 << 4) + 1)
+#define ADDI_R1_14_V1 (0x2000 + (13 << 4) + 1)
+#define ADDI_R1_12_V1 (0x2000 + (11 << 4) + 1)
+
+#define TRAP0_V2_PART0 0xc000
+#define TRAP0_V2_PART1 0x2020
+#define MOVI_R7_119_V2_PART0 0xea07
+#define MOVI_R7_119_V2_PART1 119
+#define MOVI_R7_173_V2_PART0 0xea07
+#define MOVI_R7_173_V2_PART1 173
+#define MOVI_R7_139_V2_PART0 0xea07
+#define MOVI_R7_139_V2_PART1 139
+
+#define sc_pt_regs(x) (sc->sc_##x)
+#define sc_pt_regs_lr (sc->sc_r15)
+#define sc_pt_regs_tls(x) (sc->sc_exregs[15])
 
 #define MD_FALLBACK_FRAME_STATE_FOR csky_fallback_frame_state
 
@@ -54,78 +65,66 @@ csky_fallback_frame_state (struct _Unwind_Context *context,
   int i;
 
   /* movi r7, __NR_rt_sigreturn; trap 0  */
-  if ((*(pc+0) == 0xea07) && (*(pc+1) == 119)
-      && (*(pc+2) == 0xc000) &&  (*(pc+3) == 0x2020))
-  {
-    struct sigframe
+  if ((*(pc + 0) == MOVI_R7_139_V2_PART0)
+      && (*(pc + 1) == MOVI_R7_139_V2_PART1) && (*(pc + 2) == TRAP0_V2_PART0)
+      && (*(pc + 3) == TRAP0_V2_PART1))
     {
-      int sig;
-      int code;
-      struct sigcontext *psc;
-      unsigned long extramask[2]; /* _NSIG_WORDS */
-      struct sigcontext sc;
-    } *_rt = context->cfa;
-    sc = _rt->psc; // &(_rt->sc);
-  }
-  /* movi r7, __NR_rt_sigreturn; trap 0  */
-  else if ((*(pc+0) == 0xea07) && (*(pc+1) == 173)
-	   && (*(pc+2) == 0xc000) &&  (*(pc+3) == 0x2020))
-  {
-    struct rt_sigframe
-    {
-      int sig;
-      struct siginfo *pinfo;
-      void* puc;
-      siginfo_t info;
-      struct ucontext uc;
-    } *_rt = context->cfa;
-    sc = &(_rt->uc.uc_mcontext);
-  }
+      struct rt_sigframe
+      {
+	int sig;
+	struct siginfo *pinfo;
+	void *puc;
+	siginfo_t info;
+	ucontext_t uc;
+      } *_rt = context->cfa;
+      sc = &(_rt->uc.uc_mcontext);
+    }
   else
     return _URC_END_OF_STACK;
 
-  new_cfa = (_Unwind_Ptr) sc->sc_usp;
+  new_cfa = (_Unwind_Ptr) sc_pt_regs (usp);
   fs->regs.cfa_how = CFA_REG_OFFSET;
   fs->regs.cfa_reg = STACK_POINTER_REGNUM;
   fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
 
   fs->regs.reg[0].how = REG_SAVED_OFFSET;
-  fs->regs.reg[0].loc.offset = (_Unwind_Ptr)&(sc->sc_a0) - new_cfa;
+  fs->regs.reg[0].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a0) - new_cfa;
 
   fs->regs.reg[1].how = REG_SAVED_OFFSET;
-  fs->regs.reg[1].loc.offset = (_Unwind_Ptr)&(sc->sc_a1) - new_cfa;
+  fs->regs.reg[1].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a1) - new_cfa;
 
   fs->regs.reg[2].how = REG_SAVED_OFFSET;
-  fs->regs.reg[2].loc.offset = (_Unwind_Ptr)&(sc->sc_a2) - new_cfa;
+  fs->regs.reg[2].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a2) - new_cfa;
 
   fs->regs.reg[3].how = REG_SAVED_OFFSET;
-  fs->regs.reg[3].loc.offset = (_Unwind_Ptr)&(sc->sc_a3) - new_cfa;
+  fs->regs.reg[3].loc.offset = (_Unwind_Ptr) & sc_pt_regs (a3) - new_cfa;
 
   for (i = 4; i < 14; i++)
     {
       fs->regs.reg[i].how = REG_SAVED_OFFSET;
-      fs->regs.reg[i].loc.offset = ((_Unwind_Ptr)&(sc->sc_regs[i - 4])
-				    - new_cfa);
+      fs->regs.reg[i].loc.offset =
+	(_Unwind_Ptr) & sc_pt_regs (regs[i - 4]) - new_cfa;
     }
 
-  for (i = 16; i < 32; i++)
+  for (i = 16; i < 31; i++)
     {
       fs->regs.reg[i].how = REG_SAVED_OFFSET;
-      fs->regs.reg[i].loc.offset = ((_Unwind_Ptr)&(sc->sc_exregs[i - 16])
-				    - new_cfa);
+      fs->regs.reg[i].loc.offset =
+	(_Unwind_Ptr) & sc_pt_regs (exregs[i - 16]) - new_cfa;
     }
 
+  fs->regs.reg[31].loc.offset =
+    (_Unwind_Ptr) & sc_pt_regs_tls (tls) - new_cfa;
   /* FIXME : hi lo ? */
   fs->regs.reg[15].how = REG_SAVED_OFFSET;
-  fs->regs.reg[15].loc.offset = (_Unwind_Ptr)&(sc->sc_r15) - new_cfa;
+  fs->regs.reg[15].loc.offset = (_Unwind_Ptr) & sc_pt_regs_lr - new_cfa;
 
-  fs->regs.reg[56].how = REG_SAVED_OFFSET;
-  fs->regs.reg[56].loc.offset = (_Unwind_Ptr)&(sc->sc_pc) - new_cfa;
-  fs->retaddr_column = 56;
+  fs->regs.reg[32].how = REG_SAVED_OFFSET;
+  fs->regs.reg[32].loc.offset = (_Unwind_Ptr) & sc_pt_regs (pc) - new_cfa;
+  fs->retaddr_column = 32;
   fs->signal_frame = 1;
 
   return _URC_NO_REASON;
 }
 
-
 #endif