Artyom Tarasenko schrieb: > is -single-step option supposed to work under qemu-system-sparc? Or is > it only for non-pipelined CPUs? > > I get pretty strange results: some addresses seem to be executed > twice, and then qemu hangs on the last nop: > > -------------- > IN: > 0x00000000: b 0xb788 > -------------- > IN: > 0x00000004: rd %psr, %l0 > -------------- > IN: > 0x00000004: rd %psr, %l0 > -------------- > IN: > 0x00000008: nop > -------------- > IN: > 0x00000008: nop > -------------- > IN: > 0x0000000c: nop > -------------- > IN: > 0x0000000c: nop > > ... skipped ... > > IN: > 0x7000a58c: bg 0x7000a588 > -------------- > IN: > 0x7000a590: nop > -------------- > IN: > 0x7000a590: nop > -------------- > IN: > 0x7000a594: b 0x7000a570 > -------------- > IN: > 0x7000a594: b 0x7000a570 > -------------- > IN: > 0x7000a578: be 0x7000a59c > -------------- > IN: > 0x7000a580: stba %l1, [ %l0 ] #ASI_M_BYPASS > -------------- > IN: > 0x7000a588: deccc %l2 > -------------- > IN: > 0x7000a594: b 0x7000a570 > -------------- > IN: > 0x7000a590: nop > > ^^^^^^^^^^^ That's the end > > Without -singlestep it seems to work better: > > > 0x7000a588: deccc %l2 > 0x7000a58c: bg 0x7000a588 > 0x7000a590: nop > > -------------- > IN: > 0x7000a594: b 0x7000a570 > 0x7000a598: inc %l4 > > -------------- > IN: > 0x7000a570: lduba [ %l4 ] #ASI_M_KERNELTXT, %l1 > 0x7000a574: cmp %l1, 0xff > 0x7000a578: be 0x7000a59c > ... and so on ...
I use it for x86, mips and powerpc targets. So pipelined CPUs work at least for some target architectures, and sparc's singlestep is broken. Have a look at target-mips/translate.c or target-ppc/translate.c and compare their handling of singlestep to the handling in target-sparc/translate.c. The sparc variant is very simple - too simple, I assume. Stefan
