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vmap: print pfn for register in vmalloc range [1/1]

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PD#SWPL-5564

Problem:
When open VMAP for kernel stack, if we meet kernel panic log, we
can't know physical address of stack and hard to debug.

Solution:
Print pfn for register in vmalloc range

Verify:
p212

Change-Id: Iee120df1feab88e412ef63e87c2e2bb4ad0645fb
Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>
This commit is contained in:
Tao Zeng
2019-03-07 10:17:29 +08:00
committed by Luke Go
parent 4333209505
commit c93f59a541
2 changed files with 39 additions and 0 deletions
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21
arch/arm/kernel/process.c
View File

@@ -382,6 +382,23 @@ done:
pr_cont("%s", name);
pr_cont("\n");
}
static void show_vmalloc_pfn(struct pt_regs *regs)
{
int i;
struct page *page;
for (i = 0; i < 16; i++) {
if (is_vmalloc_or_module_addr((void *)regs->uregs[i])) {
page = vmalloc_to_page((void *)regs->uregs[i]);
if (!page)
continue;
pr_info("R%-2d : %08lx, PFN:%5lx\n",
i, regs->uregs[i], page_to_pfn(page));
}
}
}
#endif /* CONFIG_AMLOGIC_USER_FAULT */
void __show_regs(struct pt_regs *regs)
@@ -440,6 +457,10 @@ void __show_regs(struct pt_regs *regs)
buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
buf[4] = '\0';
#ifdef CONFIG_AMLOGIC_USER_FAULT
show_vmalloc_pfn(regs);
#endif
#ifndef CONFIG_CPU_V7M
{
const char *segment;

18
arch/arm64/kernel/process.c
View File

@@ -293,6 +293,23 @@ static void show_user_data(unsigned long addr, int nbytes, const char *name)
pr_cont("\n");
}
}
static void show_vmalloc_pfn(struct pt_regs *regs)
{
int i;
struct page *page;
for (i = 0; i < 16; i++) {
if (is_vmalloc_or_module_addr((void *)regs->regs[i])) {
page = vmalloc_to_page((void *)regs->regs[i]);
if (!page)
continue;
pr_info("R%-2d : %016llx, PFN:%5lx\n",
i, regs->regs[i], page_to_pfn(page));
}
}
}
#endif /* CONFIG_AMLOGIC_USER_FAULT */
static void show_extra_register_data(struct pt_regs *regs, int nbytes)
@@ -468,6 +485,7 @@ void __show_regs(struct pt_regs *regs)
show_vma(current->mm, instruction_pointer(regs));
show_vma(current->mm, lr);
}
show_vmalloc_pfn(regs);
#endif /* CONFIG_AMLOGIC_USER_FAULT */
printk("pc : [<%016llx>] lr : [<%016llx>] pstate: %08llx\n",
regs->pc, lr, regs->pstate);