Re: EH handling and PR/39986

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On Fri, Dec 24, 2010 at 08:37:58AM +0000, Nick Hudson wrote:
> Attached are diffs (minus gcc mknative re-run) to support the PT_GNU_EH_FRAME 
> and dl_iterate_phdr method for finding unwind information for exception 
> handling. This is described in more detail here:
> 
>       http://www.airs.com/blog/archives/166

Attached is the first major part of the kernel support needed for using
this with statically linked binaries. Basically, we want to pass down
the auxinfo in that case too, so that the ELF header can be found.

This doesn't work completely for compat32 yet as ps_strings is broken in
that case.

Joerg

Index: src/sys/compat/netbsd32/netbsd32_exec_elf32.c
===================================================================
--- src/sys/compat/netbsd32/netbsd32_exec_elf32.c
+++ src/sys/compat/netbsd32/netbsd32_exec_elf32.c
@@ -113,11 +113,11 @@
 {
        if (itp && epp->ep_interp == NULL) {
                extern const char machine32[];
                (void)compat_elf_check_interp(epp, itp, machine32);
        }
-       epp->ep_flags |= EXEC_32;
+       epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX;
        epp->ep_vm_minaddr = VM_MIN_ADDRESS;
        epp->ep_vm_maxaddr = USRSTACK32;
 #ifdef ELF_INTERP_NON_RELOCATABLE
        *pos = ELF_LINK_ADDR;
 #endif

Index: src/sys/kern/exec_elf.c
===================================================================
--- src/sys/kern/exec_elf.c
+++ src/sys/kern/exec_elf.c
@@ -931,7 +931,8 @@
        if ((error = ELF_MD_PROBE_FUNC(l, epp, eh, itp, pos)) != 0)
                return error;
 #elif defined(ELF_INTERP_NON_RELOCATABLE)
        *pos = ELF_LINK_ADDR;
 #endif
+       epp->ep_flags |= EXEC_FORCEAUX;
        return 0;
 }