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gdbstub: x86: Switch 64/32 bit registers dynamically

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Commit 56aebc8916 changed gdbstub in way
that debugging 32 or 16-bit guest code is no longer possible with qemu
for x86_64 guest CPUs. Since that commit, qemu only provides registers
sets for 64-bit, forcing current and foreseeable gdb to also switch its
architecture to 64-bit. And this breaks if the inferior is 32 or 16 bit.

No question, this is a gdb issue. But, as it was confirmed in several
discusssions with gdb people, it is a non-trivial thing to fix. So until
qemu finds a gdb version attach with a rework x86 support, we have to
work around it by switching the register layout as the guest switches
its execution mode between 16/32 and 64 bit.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-09-17 18:14:13 +02:00 • committed by Anthony Liguori
parent 6875204c78
commit 5f30fa18ad
2 changed files with 47 additions and 15 deletions
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7
target-i386/cpu.h
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@ -570,10 +570,13 @@ typedef struct {
uint64_t mask;
} MTRRVar;
#define CPU_NB_REGS64 16
#define CPU_NB_REGS32 8
#ifdef TARGET_X86_64
#define CPU_NB_REGS 16
#define CPU_NB_REGS CPU_NB_REGS64
#else
#define CPU_NB_REGS 8
#define CPU_NB_REGS CPU_NB_REGS32
#endif
#define NB_MMU_MODES 2