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Debug first instruction in exception handler after exception

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This commit is contained in:
Stanislav Shwartsman 2007-09-26 18:07:39 +00:00
parent e812f81e7b
commit dcb0335ae9
1 changed files with 29 additions and 30 deletions
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59
bochs/cpu/cpu.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: cpu.cc,v 1.173 2007-09-25 16:11:31 sshwarts Exp $
// $Id: cpu.cc,v 1.174 2007-09-26 18:07:39 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -98,20 +98,6 @@ static unsigned iCacheMisses=0;
#endif // BX_SUPPORT_ICACHE
// notes:
// The CHECK_MAX_INSTRUCTIONS macro allows cpu_loop to execute a few
// instructions and then return so that the other processors have a chance to
// run. This is used only when simulating multiple processors.
//
// If maximum instructions have been executed, return. The zero-count
// means run forever.
#define CHECK_MAX_INSTRUCTIONS(count) \
if (count > 0) { \
count--; \
if (count == 0) return; \
}
// Make code more tidy with a few macros.
#if BX_SUPPORT_X86_64==0
#define RIP EIP
@ -191,6 +177,23 @@ BX_CPP_INLINE bxInstruction_c* BX_CPU_C::fetchInstruction(bxInstruction_c *iStor
return i;
}
// The CHECK_MAX_INSTRUCTIONS macro allows cpu_loop to execute a few
// instructions and then return so that the other processors have a chance to
// run. This is used by bochs internal debugger or when simulating
// multiple processors.
//
// If maximum instructions have been executed, return. The zero-count
// means run forever.
#if BX_SUPPORT_SMP || BX_DEBUGGER
#define CHECK_MAX_INSTRUCTIONS(count) \
if ((count) > 0) { \
(count)--; \
if ((count) == 0) return; \
}
#else
#define CHECK_MAX_INSTRUCTIONS(count)
#endif
void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
{
bxInstruction_c iStorage BX_CPP_AlignN(32);
@ -205,8 +208,12 @@ void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
if (setjmp(BX_CPU_THIS_PTR jmp_buf_env))
{
// only from exception function can we get here ...
// only from exception function we can get here ...
BX_INSTR_NEW_INSTRUCTION(BX_CPU_ID);
#if BX_DEBUGGER || BX_EXTERNAL_DEBUGGER || BX_GDBSTUB
if (dbg_instruction_epilog()) return;
#endif
CHECK_MAX_INSTRUCTIONS(max_instr_count);
#if BX_GDBSTUB
if (bx_dbg.gdbstub_enabled) {
return;
@ -264,7 +271,7 @@ void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
BX_INSTR_FETCH_DECODE_COMPLETED(BX_CPU_ID, i);
#if BX_DEBUGGER || BX_EXTERNAL_DEBUGGER || BX_GDBSTUB
if (dbg_instruction_prolog()) return;
if (dbg_instruction_prolog()) return;
#endif
#if BX_DISASM
@ -290,19 +297,12 @@ void BX_CPU_C::cpu_loop(Bit32u max_instr_count)
// inform instrumentation about new instruction
BX_INSTR_NEW_INSTRUCTION(BX_CPU_ID);
// note instr generating exceptions never reach this point
// note instructions generating exceptions never reach this point
#if BX_DEBUGGER || BX_EXTERNAL_DEBUGGER || BX_GDBSTUB
if (dbg_instruction_epilog()) return;
if (dbg_instruction_epilog()) return;
#endif
#if BX_SUPPORT_SMP || BX_DEBUGGER
// The CHECK_MAX_INSTRUCTIONS macro allows cpu_loop to execute a few
// instructions and then return so that the other processors have a chance
// to run. This is used only when simulating multiple processors. If only
// one processor, don't waste any cycles on it!
CHECK_MAX_INSTRUCTIONS(max_instr_count);
#endif
} // while (1)
}
@ -827,7 +827,7 @@ extern unsigned dbg_show_mask;
bx_bool BX_CPU_C::dbg_check_begin_instr_bpoint(void)
{
Bit64u tt = bx_pc_system.time_ticks();
bx_address debug_eip = BX_CPU_THIS_PTR prev_eip;
bx_address debug_eip = RIP;
Bit16u cs = BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value;
BX_CPU_THIS_PTR guard_found.cs = cs;
@ -929,13 +929,12 @@ bx_bool BX_CPU_C::dbg_check_begin_instr_bpoint(void)
bx_bool BX_CPU_C::dbg_check_end_instr_bpoint(void)
{
bx_address debug_eip = BX_CPU_THIS_PTR prev_eip;
BX_CPU_THIS_PTR guard_found.icount++;
BX_CPU_THIS_PTR guard_found.cs =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value;
BX_CPU_THIS_PTR guard_found.eip = debug_eip;
BX_CPU_THIS_PTR guard_found.eip = RIP;
BX_CPU_THIS_PTR guard_found.laddr =
BX_CPU_THIS_PTR get_segment_base(BX_SEG_REG_CS) + debug_eip;
BX_CPU_THIS_PTR get_segment_base(BX_SEG_REG_CS) + RIP;
BX_CPU_THIS_PTR guard_found.is_32bit_code =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b;
BX_CPU_THIS_PTR guard_found.is_64bit_code = Is64BitMode();