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target-i386: document how x86 gdb_num_core_regs is computed.

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It helps when reading the code to see how the number is arrived at.

Signed-off-by: Doug Evans <dje@google.com>
Message-Id: <94eb2c187eda43dba005406c86f7@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Doug Evans 2016-11-03 21:48:56 +00:00 committed by Paolo Bonzini
parent 2209401fa7
commit 175cad36a5
1 changed files with 3 additions and 0 deletions
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target-i386/cpu.c
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@ -3721,6 +3721,9 @@ static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
cc->write_elf32_qemunote = x86_cpu_write_elf32_qemunote;
cc->vmsd = &vmstate_x86_cpu;
#endif
/* CPU_NB_REGS * 2 = general regs + xmm regs
* 25 = eip, eflags, 6 seg regs, st[0-7], fctrl,...,fop, mxcsr.
*/
cc->gdb_num_core_regs = CPU_NB_REGS * 2 + 25;
#ifndef CONFIG_USER_ONLY
cc->debug_excp_handler = breakpoint_handler;