From 297b6bb585320c9ee650258fb3d3e7e812cdc5a8 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 14 May 2004 10:59:09 +0000
Subject: Alexandre Oliva writes:

Here are a number of minor changes to FR-V-specific bits of the uClibc
port:

- I've adjusted the definition of _dl_mmap to cope with the fact that
  there will be a definition for an mmap2-only system.

- We don't have COPY relocs, so optimize the copy reloc-related code
  away.

- Change the page size to 16KiB, to match the ABI spec, and not a
  stale value I'd copied from a linker config file.  Oops.

- Fix error handling in clone and vfork; parts of the changes by David
  Howells <dhowells@redhat.com>

- Rearrange includes in crtreloc.c.

- Change the API of __syscall_error, to reduce code size.

- Improve __syscall_return in terms of code size, so as to enable
  tail-calling of __syscall_error, at least within libc.  Ideally,
  __syscall_error should be hidden within libc.so, but this didn't
  work because of libdl.  I haven't looked into why, and figured I'd
  leave it visible for now.

- Rename enumerators and macros in sys/ucontext.h to reduce namespace
  pollution.
---
 ldso/ldso/frv/dl-syscalls.h | 18 ++++++++----------
 ldso/ldso/frv/dl-sysdep.h   | 11 +++++++----
 2 files changed, 15 insertions(+), 14 deletions(-)

(limited to 'ldso/ldso/frv')

diff --git a/ldso/ldso/frv/dl-syscalls.h b/ldso/ldso/frv/dl-syscalls.h
index b51a78a79..3cfe2d7b1 100644
--- a/ldso/ldso/frv/dl-syscalls.h
+++ b/ldso/ldso/frv/dl-syscalls.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003 Red Hat, Inc.
+/* Copyright (C) 2003, 2004 Red Hat, Inc.
    Contributed by Alexandre Oliva <aoliva@redhat.com>
 
 This file is part of uClibc.
@@ -27,28 +27,28 @@ extern int _dl_errno;
 
 /* The code below is extracted from libc/sysdeps/linux/frv/_mmap.c */
 
+#if DYNAMIC_LOADER_IN_SIMULATOR
 #define __NR___syscall_mmap2	    __NR_mmap2
 static inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr, 
 	size_t, len, int, prot, int, flags, int, fd, off_t, offset);
 
+/* Make sure we don't get another definition of _dl_mmap from the
+   machine-independent code.  */
+#undef __NR_mmap
+#undef __NR_mmap2
+
 /* This is always 12, even on architectures where PAGE_SHIFT != 12.  */
 # ifndef MMAP2_PAGE_SHIFT
 #  define MMAP2_PAGE_SHIFT 12
 # endif
 
-#if DYNAMIC_LOADER_IN_SIMULATOR
 #include <asm/page.h> /* for PAGE_SIZE */
 inline static void *_dl_memset(void*,int,size_t);
 inline static ssize_t _dl_pread(int fd, void *buf, size_t count, off_t offset);
-#endif
 
-#ifndef DYNAMIC_LOADER_IN_SIMULATOR
-inline
-#endif
 static __ptr_t
 _dl_mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
 {
-#ifdef DYNAMIC_LOADER_IN_SIMULATOR
   size_t plen = (len + PAGE_SIZE - 1) & -PAGE_SIZE;
 
 /* This is a hack to enable the dynamic loader to run within a
@@ -128,14 +128,12 @@ _dl_mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
       flags |= MAP_FIXED;
       addr = ret;
     }
-#endif
     if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
 #if 0
 	__set_errno (EINVAL);
 #endif
 	return MAP_FAILED;
     }
-#ifdef DYNAMIC_LOADER_IN_SIMULATOR
     if ((flags & MAP_FIXED) != 0)
       {
 	if (_dl_pread(fd, addr, len, offset) != (ssize_t)len)
@@ -144,9 +142,9 @@ _dl_mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
 	  _dl_memset (addr + len, 0, plen - len);
 	return addr;
       }
-#endif
     return(__syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
 }
+#endif
 
 #ifdef __NR_pread
 #ifdef DYNAMIC_LOADER_IN_SIMULATOR
diff --git a/ldso/ldso/frv/dl-sysdep.h b/ldso/ldso/frv/dl-sysdep.h
index e0faf89ed..46f8461f7 100644
--- a/ldso/ldso/frv/dl-sysdep.h
+++ b/ldso/ldso/frv/dl-sysdep.h
@@ -29,6 +29,8 @@ USA.  */
  */
 #undef ELF_USES_RELOCA
 
+#define DL_NO_COPY_RELOCS
+
 /*
  * Initialization sequence for a GOT.  Copy the resolver function
  * descriptor and the pointer to the elf_resolve/link_map data
@@ -62,10 +64,11 @@ extern int _dl_linux_resolve(void) __attribute__((__visibility__("hidden")));
 
 #define do_rem(result, n, base)  result = (n % base)
 
-/* 4096 bytes alignment */
-#define PAGE_ALIGN 0xfffff000
-#define ADDR_ALIGN 0xfff
-#define OFFS_ALIGN 0x7ffff000
+/* 16KiB page alignment.  Should perhaps be made dynamic using
+   getpagesize(), based on AT_PAGESZ from auxvt?  */
+#define PAGE_ALIGN 0xffffc000
+#define ADDR_ALIGN 0x3fff
+#define OFFS_ALIGN 0x7fffc000
 
 struct funcdesc_ht;
 
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