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.