[MIPS] Support /proc/kcore for MIPS

I'm pretty sure that the CKSEG0 bits are wrong, but I did need to cover that region - because the SB-1 kernel links at 0xffffffff80100000 or so, disassembly and printing static variables don't work unless the debugger can read that region. Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] Support /proc/kcore for MIPS
I'm pretty sure that the CKSEG0 bits are wrong, but I did need to cover that region - because the SB-1 kernel links at 0xffffffff80100000 or so, disassembly and printing static variables don't work unless the debugger can read that region. Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Daniel Jacobowitz · Ralf Baechle
1 parent e9feeb207e
Showing 1 changed file with 16 additions and 0 deletions Side-by-side Diff
arch/mips/mm/init.c
@@ -24,6 +24,7 @@
 #include <linux/bootmem.h>
 #include <linux/highmem.h>
 #include <linux/swap.h>
+#include <linux/proc_fs.h>
  
 #include <asm/bootinfo.h>
 #include <asm/cachectl.h>
@@ -200,6 +201,11 @@
 	return 0;
 }
  
+static struct kcore_list kcore_mem, kcore_vmalloc;
+#ifdef CONFIG_64BIT
+static struct kcore_list kcore_kseg0;
+#endif
+
 void __init mem_init(void)
 {
 	unsigned long codesize, reservedpages, datasize, initsize;
@@ -248,6 +254,16 @@
 	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+#ifdef CONFIG_64BIT
+	if ((unsigned long) &_text > (unsigned long) CKSEG0)
+		/* The -4 is a hack so that user tools don't have to handle
+		   the overflow.  */
+		kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
+#endif
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
+		   VMALLOC_END-VMALLOC_START);
  
 	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
...	...	@@ -24,6 +24,7 @@
24	24	#include <linux/bootmem.h>
25	25	#include <linux/highmem.h>
26	26	#include <linux/swap.h>
	27	+#include <linux/proc_fs.h>
27	28
28	29	#include <asm/bootinfo.h>
29	30	#include <asm/cachectl.h>
...	...	@@ -200,6 +201,11 @@
200	201	return 0;
201	202	}
202	203
	204	+static struct kcore_list kcore_mem, kcore_vmalloc;
	205	+#ifdef CONFIG_64BIT
	206	+static struct kcore_list kcore_kseg0;
	207	+#endif
	208	+
203	209	void __init mem_init(void)
204	210	{
205	211	unsigned long codesize, reservedpages, datasize, initsize;
...	...	@@ -248,6 +254,16 @@
248	254	codesize = (unsigned long) &_etext - (unsigned long) &_text;
249	255	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
250	256	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	257	+
	258	+#ifdef CONFIG_64BIT
	259	+ if ((unsigned long) &_text > (unsigned long) CKSEG0)
	260	+ /* The -4 is a hack so that user tools don't have to handle
	261	+ the overflow. */
	262	+ kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
	263	+#endif
	264	+ kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	265	+ kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	266	+ VMALLOC_END-VMALLOC_START);
251	267
252	268	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
253	269	"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",