From 8cb7ac090059db62f869f726ffef6f93c0e49beb Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 8 Nov 2006 02:13:47 -0500
Subject: Changed the getReg and setReg functions so that they work like
 netbsd. Apparently, gdb expects to do single stepping on its own, so those
 functions panic for SPARC. acc still needs to be implemented.

--HG--
extra : convert_revision : c6e98e37b8ab3d6f8d6b3cd2c961faa65b08a179
---
 src/arch/sparc/remote_gdb.cc | 97 +++++---------------------------------------
 1 file changed, 11 insertions(+), 86 deletions(-)

(limited to 'src/arch/sparc/remote_gdb.cc')

diff --git a/src/arch/sparc/remote_gdb.cc b/src/arch/sparc/remote_gdb.cc
index 5f9c532b8..c76f8b820 100644
--- a/src/arch/sparc/remote_gdb.cc
+++ b/src/arch/sparc/remote_gdb.cc
@@ -149,46 +149,9 @@ RemoteGDB::RemoteGDB(System *_system, ThreadContext *c)
 bool
 RemoteGDB::acc(Addr va, size_t len)
 {
-#if 0
-    Addr last_va;
-
-    va = TheISA::TruncPage(va);
-    last_va = TheISA::RoundPage(va + len);
-
-    do  {
-        if (TheISA::IsK0Seg(va)) {
-            if (va < (TheISA::K0SegBase + pmem->size())) {
-                DPRINTF(GDBAcc, "acc:   Mapping is valid  K0SEG <= "
-                        "%#x < K0SEG + size\n", va);
-                return true;
-            } else {
-                DPRINTF(GDBAcc, "acc:   Mapping invalid %#x > K0SEG + size\n",
-                        va);
-                return false;
-            }
-        }
-
-    /**
-     * This code says that all accesses to palcode (instruction and data)
-     * are valid since there isn't a va->pa mapping because palcode is
-     * accessed physically. At some point this should probably be cleaned up
-     * but there is no easy way to do it.
-     */
-
-        if (AlphaISA::PcPAL(va) || va < 0x10000)
-            return true;
-
-        Addr ptbr = context->readMiscReg(AlphaISA::IPR_PALtemp20);
-        TheISA::PageTableEntry pte = TheISA::kernel_pte_lookup(context->getPhysPort(), ptbr, va);
-        if (!pte.valid()) {
-            DPRINTF(GDBAcc, "acc:   %#x pte is invalid\n", va);
-            return false;
-        }
-        va += TheISA::PageBytes;
-    } while (va < last_va);
-
-    DPRINTF(GDBAcc, "acc:   %#x mapping is valid\n", va);
-#endif
+    //@Todo In NetBSD, this function checks if all addresses
+    //from va to va + len have valid page mape entries. Not
+    //sure how this will work for other OSes or in general.
     return true;
 }
 
@@ -204,12 +167,11 @@ RemoteGDB::getregs()
 
     gdbregs.regs[RegPc] = context->readPC();
     gdbregs.regs[RegNpc] = context->readNextPC();
-    for(int x = RegG0; x <= RegI7; x++)
+    for(int x = RegG0; x <= RegI0 + 7; x++)
         gdbregs.regs[x] = context->readIntReg(x - RegG0);
-    for(int x = RegF0; x <= RegF31; x++)
-        gdbregs.regs[x] = context->readFloatRegBits(x - RegF0);
-    gdbregs.regs[RegY] = context->readMiscReg(MISCREG_Y);
-    //XXX need to also load up Psr, Wim, Tbr, Fpsr, and Cpsr
+    //Floating point registers are left at 0 in netbsd
+    //All registers other than the pc, npc and int regs
+    //are ignored as well.
 }
 
 ///////////////////////////////////////////////////////////
@@ -223,56 +185,19 @@ RemoteGDB::setregs()
 {
     context->setPC(gdbregs.regs[RegPc]);
     context->setNextPC(gdbregs.regs[RegNpc]);
-    for(int x = RegG0; x <= RegI7; x++)
+    for(int x = RegG0; x <= RegI0 + 7; x++)
         context->setIntReg(x - RegG0, gdbregs.regs[x]);
-    for(int x = RegF0; x <= RegF31; x++)
-        context->setFloatRegBits(x - RegF0, gdbregs.regs[x]);
-    context->setMiscRegWithEffect(MISCREG_Y, gdbregs.regs[RegY]);
-    //XXX need to also set Psr, Wim, Tbr, Fpsr, and Cpsr
+    //Only the integer registers, pc and npc are set in netbsd
 }
 
 void
 RemoteGDB::clearSingleStep()
 {
-#if 0
-    DPRINTF(GDBMisc, "clearSingleStep bt_addr=%#x nt_addr=%#x\n",
-            takenBkpt.address, notTakenBkpt.address);
-
-    if (takenBkpt.address != 0)
-        clearTempBreakpoint(takenBkpt);
-
-    if (notTakenBkpt.address != 0)
-        clearTempBreakpoint(notTakenBkpt);
-#endif
+    panic("SPARC does not support hardware single stepping\n");
 }
 
 void
 RemoteGDB::setSingleStep()
 {
-#if 0
-    Addr pc = context->readPC();
-    Addr npc, bpc;
-    bool set_bt = false;
-
-    npc = pc + sizeof(MachInst);
-
-    // User was stopped at pc, e.g. the instruction at pc was not
-    // executed.
-    MachInst inst = read<MachInst>(pc);
-    StaticInstPtr si(inst);
-    if (si->hasBranchTarget(pc, context, bpc)) {
-        // Don't bother setting a breakpoint on the taken branch if it
-        // is the same as the next pc
-        if (bpc != npc)
-            set_bt = true;
-    }
-
-    DPRINTF(GDBMisc, "setSingleStep bt_addr=%#x nt_addr=%#x\n",
-            takenBkpt.address, notTakenBkpt.address);
-
-    setTempBreakpoint(notTakenBkpt, npc);
-
-    if (set_bt)
-        setTempBreakpoint(takenBkpt, bpc);
-#endif
+    panic("SPARC does not support hardware single stepping\n");
 }
-- 
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