[PATCH 15/33] Updating Offset

[Janani Venkataraman]

Updating offset throughout keeping in mind that they need to be PAGE ALIGNED.

Signed-off-by: Janani Venkataraman <janan...@linux.vnet.ibm.com>
---
 src/elf.c |   50 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/elf.c b/src/elf.c
index a5a1feb..a101ddf 100644
--- a/src/elf.c
+++ b/src/elf.c
@@ -39,6 +39,8 @@
 
 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
 
+#define ALIGN(addr, pagesize) (((addr) + (pagesize) - 1) & ~(pagesize - 1))
+
 /* Default alignment for program headers */
 #ifndef ELF_EXEC_PAGESIZE
 #define ELF_EXEC_PAGESIZE PAGESIZE
@@ -617,7 +619,6 @@ static int get_phdrs(int pid, struct core_proc *cp)
        cp_phdrs[0].p_offset = 0;
        cp_phdrs[0].p_vaddr = 0;
        cp_phdrs[0].p_paddr = 0;
-       /* Will fill the size after filling notes */
        cp_phdrs[0].p_filesz = 0;
        cp_phdrs[0].p_memsz = 0;
 
@@ -671,6 +672,50 @@ static int get_phdrs(int pid, struct core_proc *cp)
        return 0;
 }
 
+/* Updating the Offset */
+static void update_offset(struct core_proc *cp)
+{
+       Elf_Long data_offset = 0;
+       struct mem_note *note = cp->notes;
+       int i;
+       Elf_Phdr *cp_phdrs;
+       Elf_Ehdr *cp_elf;
+
+       cp_elf = (Elf_Ehdr *)cp->elf_hdr;
+       cp_phdrs = (Elf_Phdr *)cp->phdrs;
+
+       /* ELF HEADER */
+       data_offset += sizeof(Elf_Ehdr);
+
+       /* Program Headers */
+       data_offset += cp->phdrs_count * sizeof(Elf_Phdr);
+
+       /* Notes */
+       cp_phdrs[0].p_offset = data_offset;
+
+       /* Calucalating entire NOTES size */
+       while (note) {
+               data_offset += note->size;
+               note = note->next;
+       }
+
+       /* Filling PT_NOTE size */
+       cp_phdrs[0].p_filesz = data_offset - cp_phdrs[0].p_offset;
+
+       data_offset = ALIGN(data_offset, ELF_EXEC_PAGESIZE);
+
+       /* Populating offsets of Program Headers */
+       for (i = 1; i < cp->phdrs_count; i++) {
+               cp_phdrs[i].p_offset = data_offset;
+               data_offset += cp_phdrs[i].p_filesz;
+               data_offset = ALIGN(data_offset, ELF_EXEC_PAGESIZE);
+       }
+
+       /* Filling extra program header offset if phnum > PN_XNUM */
+       if (cp->phdrs_count > PN_XNUM)
+               cp_elf->e_shoff = data_offset;
+}
+
 int do_elf_coredump(int pid, struct core_proc *cp)
 {
        int ret, i;
@@ -705,5 +750,8 @@ int do_elf_coredump(int pid, struct core_proc *cp)
        if (ret)
                return -1;
 
+       /* Updating offset */
+       update_offset(cp);
+
        return 0;
 }

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