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powerpc: Add dear as a synonym for pt_regs.dar register 

Create an anonymous union for dar and dear regsiters, we can reference
dear to get the effective address when CONFIG_4xx=y or CONFIG_BOOKE=y.
Otherwise, reference dar. This makes code more clear.

Signed-off-by: Xiongwei Song <sxwjean@gmail.com>
[mpe: Reword commit title]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210807010239.416055-4-sxwjean@me.com
This commit is contained in:
Xiongwei Song 2021-08-07 09:02:38 +08:00 committed by Michael Ellerman
parent cfa47772ca
commit 4872cbd0ca
3 changed files with 7 additions and 2 deletions
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5
arch/powerpc/include/asm/ptrace.h
View File

@ -43,7 +43,10 @@ struct pt_regs
unsigned long mq;
#endif
unsigned long trap;
unsigned long dar;
union {
unsigned long dar;
unsigned long dear;
};
union {
unsigned long dsisr;
unsigned long esr;

2
arch/powerpc/kernel/process.c
View File

@ -1499,7 +1499,7 @@ static void __show_regs(struct pt_regs *regs)
trap == INTERRUPT_DATA_STORAGE ||
trap == INTERRUPT_ALIGNMENT) {
if (IS_ENABLED(CONFIG_4xx) || IS_ENABLED(CONFIG_BOOKE))
pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, regs->esr);
pr_cont("DEAR: "REG" ESR: "REG" ", regs->dear, regs->esr);
else
pr_cont("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr);
}

2
arch/powerpc/kernel/ptrace/ptrace.c
View File

@ -373,6 +373,8 @@ void __init pt_regs_check(void)
offsetof(struct user_pt_regs, trap));
BUILD_BUG_ON(offsetof(struct pt_regs, dar) !=
offsetof(struct user_pt_regs, dar));
BUILD_BUG_ON(offsetof(struct pt_regs, dear) !=
offsetof(struct user_pt_regs, dar));
BUILD_BUG_ON(offsetof(struct pt_regs, dsisr) !=
offsetof(struct user_pt_regs, dsisr));
BUILD_BUG_ON(offsetof(struct pt_regs, esr) !=