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8e8ff02c0b
This modification is required to fix debugging function for m32r targets
with !CONFIG_ISA_DSP_LEVEL2, by unifying 'struct pt_regs' and 'struct
sigcontext' size for all M32R ISA.
Some m32r processor core with !CONFIG_ISA_DSP_LEVEL2 configuration has only
single accumulator a0 (ex. VDEC2 core, M32102 core, etc.), the others with
CONFIG_ISA_DSP_LEVEL2 has two accumulators, a0 and a1.
This means there are two variations of thread context. So far, we reduced
and changed stackframe size at a syscall for their context size. However,
this causes a problem that a GDB for processors with CONFIG_ISA_DSP_LEVEL2
cannot be used for processors with !CONFIG_ISA_DSP_LEVEL2.
From the viewpoint of GDB support, we should reduce such variation of
stackframe size for simplicity.
In this patch, dummy members are added to 'struct pt_regs' and 'struct
sigcontext' to adjust their size for !CONFIG_ISA_DSP_LEVEL2.
This modification is also a one step for a GDB update in future.
Currently, on the m32r, GDB can access process's context by using ptrace
functions in a simple way of register by register access. By unifying
stackframe size, we have a possibility to make use of ptrace functions of
not only a single register access but also block register access,
PTRACE_{GETREGS,PUTREGS}.
However, for this purpose, we might have to modify stackframe structure
some more; for example, PSW (processor status word) register should be
pre-processed before pushing to stack at a syscall, and so on. In this
case, we must update carefully both kernel and GDB at a time...
Signed-off-by: Hayato Fujiwara <fujiwara@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Kei Sakamoto <ksakamot@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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| .. | ||
| align.c | ||
| asm-offsets.c | ||
| entry.S | ||
| head.S | ||
| init_task.c | ||
| io_m32104ut.c | ||
| io_m32700ut.c | ||
| io_mappi2.c | ||
| io_mappi3.c | ||
| io_mappi.c | ||
| io_oaks32r.c | ||
| io_opsput.c | ||
| io_usrv.c | ||
| irq.c | ||
| m32r_ksyms.c | ||
| Makefile | ||
| module.c | ||
| process.c | ||
| ptrace.c | ||
| semaphore.c | ||
| setup_m32104ut.c | ||
| setup_m32700ut.c | ||
| setup_mappi2.c | ||
| setup_mappi3.c | ||
| setup_mappi.c | ||
| setup_oaks32r.c | ||
| setup_opsput.c | ||
| setup_usrv.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| smpboot.c | ||
| sys_m32r.c | ||
| time.c | ||
| traps.c | ||
| vmlinux.lds.S | ||