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powerpc: Add esr as a synonym for pt_regs.dsisr

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Create an anonymous union for dsisr and esr regsiters, we can reference
esr to get the exception detail when CONFIG_4xx=y or CONFIG_BOOKE=y.
Otherwise, reference dsisr. 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/20210807010239.416055-2-sxwjean@me.com
This commit is contained in:
Xiongwei Song 2021-08-07 09:02:36 +08:00 committed by Michael Ellerman
parent e42edf9b9d
commit 4f8e78c075
6 changed files with 11 additions and 6 deletions
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5
arch/powerpc/include/asm/ptrace.h
View File

@ -44,7 +44,10 @@ struct pt_regs
#endif
unsigned long trap;
unsigned long dar;
unsigned long dsisr;
union {
unsigned long dsisr;
unsigned long esr;
};
unsigned long result;
};
};

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->dsisr);
pr_cont("DEAR: "REG" ESR: "REG" ", regs->dar, regs->esr);
else
pr_cont("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr);
}

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

@ -375,6 +375,8 @@ void __init pt_regs_check(void)
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) !=
offsetof(struct user_pt_regs, dsisr));
BUILD_BUG_ON(offsetof(struct pt_regs, result) !=
offsetof(struct user_pt_regs, result));

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

@ -562,7 +562,7 @@ static inline int check_io_access(struct pt_regs *regs)
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
/* On 4xx, the reason for the machine check or program exception
is in the ESR. */
#define get_reason(regs) ((regs)->dsisr)
#define get_reason(regs) ((regs)->esr)
#define REASON_FP ESR_FP
#define REASON_ILLEGAL (ESR_PIL | ESR_PUO)
#define REASON_PRIVILEGED ESR_PPR

4
arch/powerpc/platforms/44x/machine_check.c
View File

@ -11,7 +11,7 @@
int machine_check_440A(struct pt_regs *regs)
{
unsigned long reason = regs->dsisr;
unsigned long reason = regs->esr;
printk("Machine check in kernel mode.\n");
if (reason & ESR_IMCP){
@ -48,7 +48,7 @@ int machine_check_440A(struct pt_regs *regs)
#ifdef CONFIG_PPC_47x
int machine_check_47x(struct pt_regs *regs)
{
unsigned long reason = regs->dsisr;
unsigned long reason = regs->esr;
u32 mcsr;
printk(KERN_ERR "Machine check in kernel mode.\n");

2
arch/powerpc/platforms/4xx/machine_check.c
View File

@ -10,7 +10,7 @@
int machine_check_4xx(struct pt_regs *regs)
{
unsigned long reason = regs->dsisr;
unsigned long reason = regs->esr;
if (reason & ESR_IMCP) {
printk("Instruction");