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authorHirokazu Takata <takata@linux-m32r.org>2006-04-19 09:21:20 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-19 20:13:50 +0400
commit8e8ff02c0b61d9b7c15c7996a2eddbedf51a105b (patch)
treedde7fcedee5d8720f5cc95da5ed4629fd3369bc8 /net
parentefe87d2b822e42975b4da958c9d321cf89bfeb5a (diff)
downloadlinux-8e8ff02c0b61d9b7c15c7996a2eddbedf51a105b.tar.xz
[PATCH] m32r: Fix pt_regs for !COFNIG_ISA_DSP_LEVEL2 target
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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