From 804b11a3ed37dd429de2e4ecf3a8892843d57e12 Mon Sep 17 00:00:00 2001 From: Andreas Sandberg Date: Mon, 2 Mar 2015 04:00:27 -0500 Subject: [PATCH] arm: Correctly access the stack pointer in GDB We curently use INTREG_X31 instead of INTREG_SPX when accessing the stack pointer in GDB. gem5 normally uses INTREG_SPX to access the stack pointer, which gets mapped to the stack pointer corresponding (INTREG_SPn) to the current exception level. This changeset updates the GDB interface to use SPX instead of X31 (which is always zero) when transfering CPU state to gdb. --- src/arch/arm/remote_gdb.cc | 13 +++++++++---- src/arch/arm/remote_gdb.hh | 1 + 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/src/arch/arm/remote_gdb.cc b/src/arch/arm/remote_gdb.cc index d52a9db17..b85b45369 100644 --- a/src/arch/arm/remote_gdb.cc +++ b/src/arch/arm/remote_gdb.cc @@ -204,9 +204,10 @@ RemoteGDB::getregs() memset(gdbregs.regs, 0, gdbregs.bytes()); if (inAArch64(context)) { // AArch64 - // x0-x31 - for (int i = 0; i < 32; ++i) + // x0-x30 + for (int i = 0; i < 31; ++i) gdbregs.regs64[GDB64_X0 + i] = context->readIntReg(INTREG_X0 + i); + gdbregs.regs64[GDB64_SPX] = context->readIntReg(INTREG_SPX); // pc gdbregs.regs64[GDB64_PC] = context->pcState().pc(); // cpsr @@ -262,13 +263,17 @@ RemoteGDB::setregs() DPRINTF(GDBAcc, "setregs in remotegdb \n"); if (inAArch64(context)) { // AArch64 - // x0-x31 - for (int i = 0; i < 32; ++i) + // x0-x30 + for (int i = 0; i < 31; ++i) context->setIntReg(INTREG_X0 + i, gdbregs.regs64[GDB64_X0 + i]); // pc context->pcState(gdbregs.regs64[GDB64_PC]); // cpsr context->setMiscRegNoEffect(MISCREG_CPSR, gdbregs.regs64[GDB64_CPSR]); + // Update the stack pointer. This should be done after + // updating CPSR/PSTATE since that might affect how SPX gets + // mapped. + context->setIntReg(INTREG_SPX, gdbregs.regs64[GDB64_SPX]); // v0-v31 for (int i = 0; i < 128; i += 4) { int gdboff = GDB64_V0_32 + i; diff --git a/src/arch/arm/remote_gdb.hh b/src/arch/arm/remote_gdb.hh index 80a0bf1b1..56a50a133 100644 --- a/src/arch/arm/remote_gdb.hh +++ b/src/arch/arm/remote_gdb.hh @@ -68,6 +68,7 @@ enum { // AArch64 registers enum { GDB64_X0 = 0, + GDB64_SPX = 31, GDB64_PC = 32, GDB64_CPSR = 33, GDB64_V0 = 34, -- 2.30.2