This patch allows registers to be properly read from and written to
when using the gdbstub to debug a ppc guest running in little
endian mode. It accomplishes this goal by byte swapping the values of
any registers if the MSR:LE value is set.
Signed-off-by: Thomas Falcon<address@hidden>
---
Have created wrapper functions that swap mem_buf in-place.
mem_buf is swapped regardless of the the host's endianness if msr_le is true.
---
target-ppc/cpu-qom.h | 2 ++
target-ppc/gdbstub.c | 48 +++++++++++++++++++++++++++++++++++++++++++++
target-ppc/translate_init.c | 4 ++--
3 files changed, 52 insertions(+), 2 deletions(-)
diff --git a/target-ppc/cpu-qom.h b/target-ppc/cpu-qom.h
index 72b2232..992963f 100644
--- a/target-ppc/cpu-qom.h
+++ b/target-ppc/cpu-qom.h
@@ -109,7 +109,9 @@ void ppc_cpu_dump_statistics(CPUState *cpu, FILE *f,
fprintf_function cpu_fprintf, int flags);
hwaddr ppc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int ppc_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
+int ppc_cpu_gdb_read_register_wrap(CPUState *cpu, uint8_t *buf, int reg);
int ppc_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
+int ppc_cpu_gdb_write_register_wrap(CPUState *cpu, uint8_t *buf, int reg);
int ppc64_cpu_write_elf64_qemunote(WriteCoreDumpFunction f,
CPUState *cpu, void *opaque);
int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
diff --git a/target-ppc/gdbstub.c b/target-ppc/gdbstub.c
index 1c91090..964fd85 100644
--- a/target-ppc/gdbstub.c
+++ b/target-ppc/gdbstub.c
@@ -21,6 +21,54 @@
#include "qemu-common.h"
#include "exec/gdbstub.h"
+/* The following functions are used to ensure the correct
+ * transfer of registers between a little endian ppc target
+ * and a big endian host by checking the LE bit in the Machine State Register
+ */
+
+int ppc_cpu_gdb_read_register_wrap(CPUState *cs, uint8_t *mem_buf, int n)
+{
+ PowerPCCPU *cpu = POWERPC_CPU(cs);
+ CPUPPCState *env = &cpu->env;
+
+ int len = ppc_cpu_gdb_read_register(cs, mem_buf, n),i;
+ if(msr_le)
+ {
+ uint8_t tmp;
+ for(i=0;i<len/2;i++)
+ {
+ tmp=*(mem_buf+i);
+ *(mem_buf+i)=*(mem_buf+len-1-i);
+ *(mem_buf+len-1-i)=tmp;
+ }
+ }
+ return len;
+}
+
+int ppc_cpu_gdb_write_register_wrap(CPUState *cs, uint8_t *mem_buf, int n)
+{
+ PowerPCCPU *cpu = POWERPC_CPU(cs);
+ CPUPPCState *env = &cpu->env;
+ if(msr_le)
+ {
+ int len=0,i=0;
+ / if(n < 64)
+ len=8;
+ else if(n == 66)
+ len=4;
+ else
+ len = sizeof(target_ulong);
+ uint8_t tmp;
+ for(i=0;i<len/2;i++)
+ {
+ tmp=*(mem_buf+i);
+ *(mem_buf+i)=*(mem_buf+len-1-i);
+ *(mem_buf+len-1-i)=tmp;
+ }
+ }
+ return ppc_cpu_gdb_write_register(cs, mem_buf, n);