调试 – 如何使用gdb转储ARM协处理器寄存器？

2023年8月11日 397次阅读

有没有办法从gdb转储ARM的协处理器寄存器(特别是CP15 sctlr)？我正在使用code-sourcery(arm-none-
linux-gnueabi-)的工具链和调试在QEMU上运行的linux.

一种方法是在mcr / mrc指令之前/之后转储使用过的GPR.还有另外一种方法吗？

最佳答案 据我所知,GDB / ARM将无法显示此信息…但调试qemu可能会对您有所帮助(假设您可以使用其调试信息编译/调试qemu)：

>将GDB(i686某些,但不是ARM)附加到qemu进程
>看一下这个文件：qemu/target-arm/cpu.h
>检查env-> cp15或gdbserver_state-> g_cpu-> cp15 *之类的内容：

struct {
uint32_t c0_cachetype;
uint32_t c0_ccsid[16]; /* Cache size.  */
uint32_t c0_clid; /* Cache level.  */
uint32_t c0_cssel; /* Cache size selection.  */
uint32_t c0_c1[8]; /* Feature registers.  */
uint32_t c0_c2[8]; /* Instruction set registers.  */
uint32_t c1_sys; /* System control register.  */
uint32_t c1_coproc; /* Coprocessor access register.  */
uint32_t c1_xscaleauxcr; /* XScale auxiliary control register.  */
uint32_t c2_base0; /* MMU translation table base 0.  */
uint32_t c2_base1; /* MMU translation table base 1.  */
uint32_t c2_control; /* MMU translation table base control.  */
uint32_t c2_mask; /* MMU translation table base selection mask.  */
uint32_t c2_base_mask; /* MMU translation table base 0 mask. */
uint32_t c2_data; /* MPU data cachable bits.  */
uint32_t c2_insn; /* MPU instruction cachable bits.  */
uint32_t c3; /* MMU domain access control register
                MPU write buffer control.  */
uint32_t c5_insn; /* Fault status registers.  */
uint32_t c5_data;
uint32_t c6_region[8]; /* MPU base/size registers.  */
uint32_t c6_insn; /* Fault address registers.  */
uint32_t c6_data;
uint32_t c9_insn; /* Cache lockdown registers.  */
uint32_t c9_data;
uint32_t c13_fcse; /* FCSE PID.  */
uint32_t c13_context; /* Context ID.  */
uint32_t c13_tls1; /* User RW Thread register.  */
uint32_t c13_tls2; /* User RO Thread register.  */
uint32_t c13_tls3; /* Privileged Thread register.  */
uint32_t c15_cpar; /* XScale Coprocessor Access Register */
uint32_t c15_ticonfig; /* TI925T configuration byte.  */
uint32_t c15_i_max; /* Maximum D-cache dirty line index.  */
uint32_t c15_i_min; /* Minimum D-cache dirty line index.  */
uint32_t c15_threadid; /* TI debugger thread-ID.  */
} cp15;

*我不确定确切的位置,只是基于qemu/gdbstub.c的一些猜测,但我无法实际测试它.

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