[PPC32] Make PPC32 unwinding work for real.

include/libunwind-ppc32.h

@@ -62,7 +62,7 @@ extern "C" {
  * round that up to 280.
  */
 
-#define UNW_TDEP_CURSOR_LEN 280
+#define UNW_TDEP_CURSOR_LEN 200
 
 #if __WORDSIZE==32
 typedef uint32_t unw_word_t;
@@ -109,7 +109,22 @@ typedef enum
     UNW_PPC32_R30,
     UNW_PPC32_R31, /* called HARD_FRAME_POINTER in gcc */
 
-    UNW_PPC32_F0 = 32,
+    /* Count Register */
+    UNW_PPC32_CTR = 32,
+    /* Fixed-Point Status and Control Register */
+    UNW_PPC32_XER = 33,
+    /* Condition Register */
+    UNW_PPC32_CCR = 34,
+    /* Machine State Register */
+    //UNW_PPC32_MSR = 35,
+    /* MQ or SPR0, not part of generic Power, part of MPC601 */
+    //UNW_PPC32_MQ = 36,
+    /* Link Register */
+    UNW_PPC32_LR = 36,
+    /* Floating Pointer Status and Control Register */
+    UNW_PPC32_FPSCR = 37,
+
+    UNW_PPC32_F0 = 48,
     UNW_PPC32_F1,
     UNW_PPC32_F2,
     UNW_PPC32_F3,
@@ -142,43 +157,9 @@ typedef enum
     UNW_PPC32_F30,
     UNW_PPC32_F31,
 
-/* Note that there doesn't appear to be an .eh_frame register column
+    UNW_TDEP_LAST_REG = UNW_PPC32_F31,
-       for the FPSCR register.  I don't know why this is.  Since .eh_frame
-       info is what this implementation uses for unwinding, we have no way
-       to unwind this register, and so we will not expose an FPSCR register
-       number in the libunwind API.
-     */
 
-    UNW_PPC32_LR = 65,
+    UNW_TDEP_IP = UNW_PPC32_LR,
-    UNW_PPC32_CTR = 66,
-    UNW_PPC32_ARG_POINTER = 67,
-
-    UNW_PPC32_CR0 = 68,
-    UNW_PPC32_CR1,
-    UNW_PPC32_CR2,
-    UNW_PPC32_CR3,
-    UNW_PPC32_CR4,
-
-    /* CR5 .. CR7 are currently unused */
-    UNW_PPC32_CR5,
-    UNW_PPC32_CR6,
-    UNW_PPC32_CR7,
-
-    UNW_PPC32_XER = 76,
-
-    UNW_PPC32_VRSAVE = 109,
-    UNW_PPC32_VSCR = 110,
-    UNW_PPC32_SPE_ACC = 111,
-    UNW_PPC32_SPEFSCR = 112,
-
-    /* frame info (read-only) */
-    UNW_PPC32_FRAME_POINTER,
-    UNW_PPC32_NIP,
-
-
-    UNW_TDEP_LAST_REG = UNW_PPC32_NIP,
-
-    UNW_TDEP_IP = UNW_PPC32_NIP,
     UNW_TDEP_SP = UNW_PPC32_R1,
     UNW_TDEP_EH = UNW_PPC32_R12
   }

src/ppc32/Gglobal.c

@@ -68,6 +68,12 @@ uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH] =
 	[UNW_PPC32_R30]=UNW_PPC32_R30,
 	[UNW_PPC32_R31]=UNW_PPC32_R31,
 
+	[UNW_PPC32_CTR]=UNW_PPC32_CTR,
+	[UNW_PPC32_XER]=UNW_PPC32_XER,
+	[UNW_PPC32_CCR]=UNW_PPC32_CCR,
+	[UNW_PPC32_LR]=UNW_PPC32_LR,
+	[UNW_PPC32_FPSCR]=UNW_PPC32_FPSCR,
+
 	[UNW_PPC32_F0]=UNW_PPC32_F0,
 	[UNW_PPC32_F1]=UNW_PPC32_F1,
 	[UNW_PPC32_F2]=UNW_PPC32_F2,
@@ -100,25 +106,6 @@ uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH] =
 	[UNW_PPC32_F29]=UNW_PPC32_F29,
 	[UNW_PPC32_F30]=UNW_PPC32_F30,
 	[UNW_PPC32_F31]=UNW_PPC32_F31,
-
-	[UNW_PPC32_LR]=UNW_PPC32_LR,
-	[UNW_PPC32_CTR]=UNW_PPC32_CTR,
-	[UNW_PPC32_ARG_POINTER]=UNW_PPC32_ARG_POINTER,
-
-	[UNW_PPC32_CR0]=UNW_PPC32_CR0,
-	[UNW_PPC32_CR1]=UNW_PPC32_CR1,
-	[UNW_PPC32_CR2]=UNW_PPC32_CR2,
-	[UNW_PPC32_CR3]=UNW_PPC32_CR3,
-	[UNW_PPC32_CR4]=UNW_PPC32_CR4,
-	[UNW_PPC32_CR5]=UNW_PPC32_CR5,
-	[UNW_PPC32_CR6]=UNW_PPC32_CR6,
-	[UNW_PPC32_CR7]=UNW_PPC32_CR7,
-
-	[UNW_PPC32_XER]=UNW_PPC32_XER,
-	[UNW_PPC32_VRSAVE]=UNW_PPC32_VRSAVE,
-	[UNW_PPC32_VSCR]=UNW_PPC32_VSCR,
-	[UNW_PPC32_SPE_ACC]=UNW_PPC32_SPE_ACC,
-	[UNW_PPC32_SPEFSCR]=UNW_PPC32_SPEFSCR,
 };
 
 HIDDEN void

src/ppc32/Ginit.c

@@ -55,7 +55,9 @@ uc_addr (ucontext_t *uc, int reg)
   if ((unsigned) (reg - UNW_PPC32_R0) < 32)
     addr = &uc->uc_mcontext.uc_regs->gregs[reg - UNW_PPC32_R0];
 
-  else if ((unsigned) (reg - UNW_PPC32_F0) < 32)
+  else
+  if ( ((unsigned) (reg - UNW_PPC32_F0) < 32) &&
+       ((unsigned) (reg - UNW_PPC32_F0) >= 0) )
     addr = &uc->uc_mcontext.uc_regs->fpregs.fpregs[reg - UNW_PPC32_F0];
 
   else
@@ -64,9 +66,6 @@ uc_addr (ucontext_t *uc, int reg)
 
       switch (reg)
 	{
-	case UNW_PPC32_NIP:
-	  gregs_idx = NIP_IDX;
-	  break;
 	case UNW_PPC32_CTR:
 	  gregs_idx = CTR_IDX;
 	  break;
@@ -76,7 +75,7 @@ uc_addr (ucontext_t *uc, int reg)
 	case UNW_PPC32_XER:
 	  gregs_idx = XER_IDX;
 	  break;
-	case UNW_PPC32_CR0:
+	case UNW_PPC32_CCR:
 	  gregs_idx = CCR_IDX;
 	  break;
 	default:
@@ -138,7 +137,8 @@ access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val,
   unw_word_t *addr;
   ucontext_t *uc = arg;
 
-  if ((unsigned int) (reg - UNW_PPC32_F0) < 32)
+  if ( ((unsigned int) (reg - UNW_PPC32_F0) < 32) &&
+       ((unsigned int) (reg - UNW_PPC32_F0) >= 0))
     goto badreg;
 
   addr = uc_addr (uc, reg);

src/ppc32/Gstep.c

@@ -44,7 +44,6 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 typedef struct
 {
   long unsigned back_chain;
-  long unsigned cr_save;
   long unsigned lr_save;
   /* many more fields here, but they are unused by this code */
 } stack_frame_t;
@@ -55,8 +54,8 @@ unw_step (unw_cursor_t * cursor)
 {
   struct cursor *c = (struct cursor *) cursor;
   stack_frame_t dummy;
-  unw_word_t back_chain_offset, lr_save_offset, v_regs_ptr;
+  unw_word_t back_chain_offset, lr_save_offset;
-  struct dwarf_loc back_chain_loc, lr_save_loc, sp_loc, ip_loc, v_regs_loc;
+  struct dwarf_loc back_chain_loc, lr_save_loc, sp_loc, ip_loc;
   int ret;
 
   Debug (1, "(cursor=%p, ip=0x%016lx)\n", c, (unsigned long) c->dwarf.ip);
@@ -141,7 +140,7 @@ unw_step (unw_cursor_t * cursor)
 	  c->sigcontext_addr = ucontext;
 
 	  sp_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R1, 0);
-	  ip_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_NIP, 0);
+	  ip_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_LINK, 0);
 
 	  ret = dwarf_get (&c->dwarf, sp_loc, &c->dwarf.cfa);
 	  if (ret < 0)
@@ -229,21 +228,14 @@ unw_step (unw_cursor_t * cursor)
 	    DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_LINK, 0);
 	  c->dwarf.loc[UNW_PPC32_CTR] =
 	    DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_CTR, 0);
+
 	  /* This CR0 assignment is probably wrong.  There are 8 dwarf columns
 	     assigned to the CR registers, but only one CR register in the
 	     mcontext structure */
-	  c->dwarf.loc[UNW_PPC32_CR0] =
+	  c->dwarf.loc[UNW_PPC32_CCR] =
 	    DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_CCR, 0);
 	  c->dwarf.loc[UNW_PPC32_XER] =
 	    DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_XER, 0);
-	  c->dwarf.loc[UNW_PPC32_NIP] =
-	    DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_NIP, 0);
-
-	  /* TODO: Is there a way of obtaining the value of the
-	     pseudo frame pointer (which is sp + some fixed offset, I
-	     assume), based on the contents of the ucontext record
-	     structure?  For now, set this loc to null. */
-	  c->dwarf.loc[UNW_PPC32_FRAME_POINTER] = DWARF_NULL_LOC;
 
 	  c->dwarf.loc[UNW_PPC32_F0] =
 	    DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R0, 0);

src/ppc32/init.h

@@ -42,22 +42,13 @@ common_init_ppc32 (struct cursor *c)
     c->dwarf.loc[i] = DWARF_FPREG_LOC (&c->dwarf, i);
   }
 
-  for (i = UNW_PPC32_CR0; i <= UNW_PPC32_CR7; i++) {
-    c->dwarf.loc[i] = DWARF_REG_LOC (&c->dwarf, i);
-  }
-  c->dwarf.loc[UNW_PPC32_ARG_POINTER] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_ARG_POINTER);
   c->dwarf.loc[UNW_PPC32_CTR] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_CTR);
-  c->dwarf.loc[UNW_PPC32_VSCR] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_VSCR);
-
   c->dwarf.loc[UNW_PPC32_XER] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_XER);
+  c->dwarf.loc[UNW_PPC32_CCR] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_CCR);
   c->dwarf.loc[UNW_PPC32_LR] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_LR);
-  c->dwarf.loc[UNW_PPC32_VRSAVE] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_VRSAVE);
+  c->dwarf.loc[UNW_PPC32_FPSCR] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_FPSCR);
-  c->dwarf.loc[UNW_PPC32_SPEFSCR] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_SPEFSCR);
-  c->dwarf.loc[UNW_PPC32_SPE_ACC] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_SPE_ACC);
 
-  c->dwarf.loc[UNW_PPC32_NIP] = DWARF_REG_LOC (&c->dwarf, UNW_PPC32_NIP);
+  ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_PPC32_LR], &c->dwarf.ip);
-
-  ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_PPC32_NIP], &c->dwarf.ip);
   if (ret < 0)
     return ret;
 

src/ppc32/regname.c

@@ -62,6 +62,12 @@ static const char *regname[] =
     [UNW_PPC32_R30]="GPR30",
     [UNW_PPC32_R31]="GPR31",
 
+    [UNW_PPC32_CTR]="CTR",
+    [UNW_PPC32_XER]="XER",
+    [UNW_PPC32_CCR]="CCR",
+    [UNW_PPC32_LR]="LR",
+    [UNW_PPC32_FPSCR]="FPSCR",
+
     [UNW_PPC32_F0]="FPR0",
     [UNW_PPC32_F1]="FPR1",
     [UNW_PPC32_F2]="FPR2",
@@ -93,29 +99,7 @@ static const char *regname[] =
     [UNW_PPC32_F28]="FPR28",
     [UNW_PPC32_F29]="FPR29",
     [UNW_PPC32_F30]="FPR30",
-    [UNW_PPC32_F31]="FPR31",
+    [UNW_PPC32_F31]="FPR31"
-
-    [UNW_PPC32_LR]="LR",
-    [UNW_PPC32_CTR]="CTR",
-    [UNW_PPC32_ARG_POINTER]="ARG_POINTER",
-
-    [UNW_PPC32_CR0]="CR0",
-    [UNW_PPC32_CR1]="CR1",
-    [UNW_PPC32_CR2]="CR2",
-    [UNW_PPC32_CR3]="CR3",
-    [UNW_PPC32_CR4]="CR4",
-    [UNW_PPC32_CR5]="CR5",
-    [UNW_PPC32_CR6]="CR6",
-    [UNW_PPC32_CR7]="CR7",
-
-    [UNW_PPC32_XER]="XER",
-
-    [UNW_PPC32_VSCR]="VSCR",
-
-    [UNW_PPC32_VRSAVE]="VRSAVE",
-    [UNW_PPC32_SPE_ACC]="SPE_ACC",
-    [UNW_PPC32_SPEFSCR]="SPEFSCR",
-
 };
 
 PROTECTED const char *

src/ppc32/ucontext_i.h

@@ -33,21 +33,13 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
    /usr/src/linux-2.6.18-1.8/arch/powerpc/kernel/ppc32.h
 */
 
-#define NIP_IDX		32
+//#define NIP_IDX		32
-#define MSR_IDX		33
+#define CTR_IDX		32
-#define ORIG_GPR3_IDX	34
+#define XER_IDX		33
-#define CTR_IDX		35
+#define CCR_IDX		34
+#define MSR_IDX		35
+//#define MQ_IDX		36
 #define LINK_IDX	36
-#define XER_IDX		37
-#define CCR_IDX		38
-#define SOFTE_IDX	39
-#define TRAP_IDX	40
-#define DAR_IDX		41
-#define DSISR_IDX	42
-#define RESULT_IDX	43
-
-#define VSCR_IDX        32
-#define VRSAVE_IDX      33
 
 /* These are dummy structures used only for obtaining the offsets of the
    various structure members. */
@@ -86,7 +78,7 @@ static vrregset_t dmy_vrregset;
 #define UC_MCONTEXT_GREGS_R29 ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[29] - (void *)&dmy_ctxt)
 #define UC_MCONTEXT_GREGS_R30 ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[30] - (void *)&dmy_ctxt)
 #define UC_MCONTEXT_GREGS_R31 ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[31] - (void *)&dmy_ctxt)
-#define UC_MCONTEXT_GREGS_NIP ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[NIP_IDX] - (void *)&dmy_ctxt)
+
 #define UC_MCONTEXT_GREGS_MSR ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[MSR_IDX] - (void *)&dmy_ctxt)
 #define UC_MCONTEXT_GREGS_ORIG_GPR3 ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[ORIG_GPR3_IDX] - (void *)&dmy_ctxt)
 #define UC_MCONTEXT_GREGS_CTR ((void *)&dmy_ctxt.uc_mcontext.uc_regs->gregs[CTR_IDX] - (void *)&dmy_ctxt)
@@ -133,41 +125,4 @@ static vrregset_t dmy_vrregset;
 #define UC_MCONTEXT_FREGS_R31 ((void *)&dmy_ctxt.uc_mcontext.uc_regs->fpregs.fpregs[31] - (void *)&dmy_ctxt)
 #define UC_MCONTEXT_FREGS_FPSCR ((void *)&dmy_ctxt.uc_mcontext.uc_regs->fpregs.fpregs[32] - (void *)&dmy_ctxt)
 
-#define UC_MCONTEXT_V_REGS ((void *)&dmy_ctxt.uc_mcontext.v_regs - (void *)&dmy_ctxt)
-
-#define UC_MCONTEXT_VREGS_R0 ((void *)&dmy_vrregset.vrregs[0] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R1 ((void *)&dmy_vrregset.vrregs[1] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R2 ((void *)&dmy_vrregset.vrregs[2] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R3 ((void *)&dmy_vrregset.vrregs[3] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R4 ((void *)&dmy_vrregset.vrregs[4] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R5 ((void *)&dmy_vrregset.vrregs[5] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R6 ((void *)&dmy_vrregset.vrregs[6] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R7 ((void *)&dmy_vrregset.vrregs[7] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R8 ((void *)&dmy_vrregset.vrregs[8] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R9 ((void *)&dmy_vrregset.vrregs[9] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R10 ((void *)&dmy_vrregset.vrregs[10] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R11 ((void *)&dmy_vrregset.vrregs[11] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R12 ((void *)&dmy_vrregset.vrregs[12] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R13 ((void *)&dmy_vrregset.vrregs[13] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R14 ((void *)&dmy_vrregset.vrregs[14] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R15 ((void *)&dmy_vrregset.vrregs[15] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R16 ((void *)&dmy_vrregset.vrregs[16] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R17 ((void *)&dmy_vrregset.vrregs[17] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R18 ((void *)&dmy_vrregset.vrregs[18] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R19 ((void *)&dmy_vrregset.vrregs[19] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R20 ((void *)&dmy_vrregset.vrregs[20] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R21 ((void *)&dmy_vrregset.vrregs[21] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R22 ((void *)&dmy_vrregset.vrregs[22] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R23 ((void *)&dmy_vrregset.vrregs[23] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R24 ((void *)&dmy_vrregset.vrregs[24] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R25 ((void *)&dmy_vrregset.vrregs[25] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R26 ((void *)&dmy_vrregset.vrregs[26] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R27 ((void *)&dmy_vrregset.vrregs[27] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R28 ((void *)&dmy_vrregset.vrregs[28] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R29 ((void *)&dmy_vrregset.vrregs[29] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R30 ((void *)&dmy_vrregset.vrregs[30] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_R31 ((void *)&dmy_vrregset.vrregs[31] - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_VSCR ((void *)&dmy_vrregset.vscr - (void *)&dmy_vrregset)
-#define UC_MCONTEXT_VREGS_VRSAVE ((void *)&dmy_vrregset.vrsave - (void *)&dmy_vrregset)
-
 #endif