From 8e8ff02c0b61d9b7c15c7996a2eddbedf51a105b Mon Sep 17 00:00:00 2001 From: Hirokazu Takata Date: Tue, 18 Apr 2006 22:21:20 -0700 Subject: [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 Signed-off-by: Hirokazu Takata Cc: Kei Sakamoto Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-m32r/assembler.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/asm-m32r/assembler.h') diff --git a/include/asm-m32r/assembler.h b/include/asm-m32r/assembler.h index b7f4d8aaeb4..1a1aa17edd3 100644 --- a/include/asm-m32r/assembler.h +++ b/include/asm-m32r/assembler.h @@ -109,6 +109,9 @@ push r13 mvfachi r13 push r13 + ldi r13, #0 + push r13 ; dummy push acc1h + push r13 ; dummy push acc1l #else #error unknown isa configuration #endif @@ -156,6 +159,8 @@ pop r13 mvtaclo r13, a1 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) + pop r13 ; dummy pop acc1h + pop r13 ; dummy pop acc1l pop r13 mvtachi r13 pop r13 -- cgit v1.2.3