[PATCH 5/7] prepare the dump loads for kcore analysis

[bhe at redhat.com]

On 07/23/14 at 07:20am, Atsushi Kumagai wrote:
> >In kcore, only  "System Ram" and "kernel text" program segments
> >are needed. And to be more precise, exclude the crashkernel
> >memory range.
> >
> >Signed-off-by: Baoquan He <bhe at redhat.com>
> 
> Please fix the compiler warnings below:
> 
> warning.c:858: warning: implicit declaration of function ‘is_vmalloc_addr’
> warning.c:854: warning: unused variable ‘paddr’

Will do.

Thanks
Baoquan

> 
> 
> Thanks
> Atsushi Kumagai
> 
> >---
> > elf_info.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > elf_info.h |   1 +
> > 2 files changed, 136 insertions(+)
> >
> >diff --git a/elf_info.c b/elf_info.c
> >index 1a3e3bd..ca63d34 100644
> >--- a/elf_info.c
> >+++ b/elf_info.c
> >@@ -779,6 +779,141 @@ get_elf_loads(int fd, char *filename)
> > 	return TRUE;
> > }
> >
> >+static int exclude_segment(struct pt_load_segment **pt_loads, unsigned int	*num_pt_loads, uint64_t start,
> >uint64_t end)
> >+{
> >+        int i, j, tidx = -1;
> >+	unsigned long long	vstart, vend, kvstart, kvend;
> >+        struct pt_load_segment temp_seg = {0};
> >+	kvstart = (ulong)start | PAGE_OFFSET;
> >+	kvend = (ulong)end | PAGE_OFFSET;
> >+	unsigned long size;
> >+
> >+        for (i = 0; i < (*num_pt_loads); i++) {
> >+                vstart = (*pt_loads)[i].virt_start;
> >+                vend = (*pt_loads)[i].virt_end;
> >+                if (kvstart <  vend && kvend > vstart) {
> >+                        if (kvstart != vstart && kvend != vend) {
> >+				/* Split load segment */
> >+				temp_seg.phys_start = end +1;
> >+				temp_seg.phys_end = (*pt_loads)[i].phys_end;
> >+				temp_seg.virt_start = kvend + 1;
> >+				temp_seg.virt_end = vend;
> >+				temp_seg.file_offset = (*pt_loads)[i].file_offset + temp_seg.virt_start -
> >(*pt_loads)[i].virt_start;
> >+
> >+				(*pt_loads)[i].virt_end = kvstart - 1;
> >+				(*pt_loads)[i].phys_end =  start -1;
> >+
> >+				tidx = i+1;
> >+                        } else if (kvstart != vstart) {
> >+				(*pt_loads)[i].phys_end = start - 1;
> >+				(*pt_loads)[i].virt_end = kvstart - 1;
> >+                        } else {
> >+				(*pt_loads)[i].phys_start = end + 1;
> >+				(*pt_loads)[i].virt_start = kvend + 1;
> >+                        }
> >+                }
> >+        }
> >+        /* Insert split load segment, if any. */
> >+	if (tidx >= 0) {
> >+		size = (*num_pt_loads + 1) * sizeof((*pt_loads)[0]);
> >+		(*pt_loads) = realloc((*pt_loads), size);
> >+		if  (!(*pt_loads) ) {
> >+		    ERRMSG("Cannot realloc %ld bytes: %s\n",
> >+		            size + 0UL, strerror(errno));
> >+			exit(1);
> >+		}
> >+		for (j = (*num_pt_loads - 1); j >= tidx; j--)
> >+		        (*pt_loads)[j+1] = (*pt_loads)[j];
> >+		(*pt_loads)[tidx] = temp_seg;
> >+		(*num_pt_loads)++;
> >+        }
> >+        return 0;
> >+}
> >+
> >+static int
> >+process_dump_load(struct pt_load_segment	*pls)
> >+{
> >+	unsigned long long paddr;
> >+
> >+	paddr = vaddr_to_paddr(pls->virt_start);
> >+	pls->phys_start  = paddr;
> >+	pls->phys_end    = paddr + (pls->virt_end - pls->virt_start);
> >+	DEBUG_MSG("process_dump_load\n");
> >+	DEBUG_MSG("  phys_start : %llx\n", pls->phys_start);
> >+	DEBUG_MSG("  phys_end   : %llx\n", pls->phys_end);
> >+	DEBUG_MSG("  virt_start : %llx\n", pls->virt_start);
> >+	DEBUG_MSG("  virt_end   : %llx\n", pls->virt_end);
> >+
> >+	return TRUE;
> >+}
> >+
> >+int get_kcore_dump_loads()
> >+{
> >+	struct pt_load_segment	*pls;
> >+	int i, j, loads=0;
> >+	unsigned long long paddr;
> >+
> >+	for (i = 0; i < num_pt_loads; ++i) {
> >+		struct pt_load_segment *p = &pt_loads[i];
> >+		if (is_vmalloc_addr(p->virt_start))
> >+			continue;
> >+		loads++;
> >+	}
> >+
> >+	pls = calloc(sizeof(struct pt_load_segment), loads);
> >+	if (pls == NULL) {
> >+		ERRMSG("Can't allocate memory for the PT_LOAD. %s\n",
> >+		    strerror(errno));
> >+		return FALSE;
> >+	}
> >+
> >+	for (i = 0, j=0; i < num_pt_loads; ++i) {
> >+		struct pt_load_segment *p = &pt_loads[i];
> >+		if (is_vmalloc_addr(p->virt_start))
> >+			continue;
> >+		if (j >= loads)
> >+			return FALSE;
> >+
> >+		if (j == 0) {
> >+			offset_pt_load_memory = p->file_offset;
> >+			if (offset_pt_load_memory == 0) {
> >+				ERRMSG("Can't get the offset of page data.\n");
> >+				return FALSE;
> >+			}
> >+		}
> >+
> >+		pls[j] = *p;
> >+		process_dump_load(&pls[j]);
> >+		j++;
> >+	}
> >+
> >+	free(pt_loads);
> >+	pt_loads = pls;
> >+	num_pt_loads = loads;
> >+
> >+	for (i=0; i<crash_reserved_mem_nr; i++)
> >+	{
> >+		exclude_segment(&pt_loads, &num_pt_loads, crash_reserved_mem[i].start, crash_reserved_mem[i].end);
> >+	}
> >+
> >+	max_file_offset = 0;
> >+	for (i = 0; i < num_pt_loads; ++i) {
> >+		struct pt_load_segment *p = &pt_loads[i];
> >+		max_file_offset = MAX(max_file_offset,
> >+				      p->file_offset + p->phys_end - p->phys_start);
> >+	}
> >+
> >+	for (i = 0; i < num_pt_loads; ++i) {
> >+		struct pt_load_segment *p = &pt_loads[i];
> >+		DEBUG_MSG("LOAD (%d)\n", i);
> >+		DEBUG_MSG("  phys_start : %llx\n", p->phys_start);
> >+		DEBUG_MSG("  phys_end   : %llx\n", p->phys_end);
> >+		DEBUG_MSG("  virt_start : %llx\n", p->virt_start);
> >+		DEBUG_MSG("  virt_end   : %llx\n", p->virt_end);
> >+	}
> >+
> >+	return TRUE;
> >+}
> >
> > /*
> >  * Get ELF information about /proc/vmcore.
> >diff --git a/elf_info.h b/elf_info.h
> >index 3ce0138..ba27fdf 100644
> >--- a/elf_info.h
> >+++ b/elf_info.h
> >@@ -46,6 +46,7 @@ int get_elf_info(int fd, char *filename);
> > void free_elf_info(void);
> > int get_elf_loads(int fd, char *filename);
> > int set_kcore_vmcoreinfo(uint64_t vmcoreinfo_addr, uint64_t vmcoreinfo_len);
> >+int get_kcore_dump_loads();
> >
> > int is_elf64_memory(void);
> > int is_xen_memory(void);
> >--
> >1.8.4.2
> 
> 
> _______________________________________________
> kexec mailing list
> kexec at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec