Binfmt_flat: Add minimum support for the Blackfin relocations

Add minimum support for the Blackfin relocations, since we don't have
enough space in each reloc.  The idea is to store a value with one
relocation so that subsequent ones can access it.

Actually, this patch is required for Blackfin.  Currently if BINFMT_FLAT is
enabled, git-tree kernel will fail to compile.

Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Cc: David McCullough <davidm@snapgear.com>
Cc: Greg Ungerer <gerg@snapgear.com>
Cc: Miles Bader <miles.bader@necel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

6 files changed, 15 insertions, 6 deletions

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 861141b4f6d6..34e9b06a7444 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -742,6 +742,7 @@ static int load_flat_file(struct linux_binprm * bprm,
          * __start to address 4 so that is okay).
          */
         if (rev > OLD_FLAT_VERSION) {
+                unsigned long persistent = 0;
                 for (i=0; i < relocs; i++) {
                         unsigned long addr, relval;
 
@@ -749,6 +750,8 @@ static int load_flat_file(struct linux_binprm * bprm,
                            relocated (of course, the address has to be
                            relocated first).  */
                         relval = ntohl(reloc[i]);
+                        if (flat_set_persistent (relval, &persistent))
+                                continue;
                         addr = flat_get_relocate_addr(relval);
                         rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
                         if (rp == (unsigned long *)RELOC_FAILED) {
@@ -757,7 +760,7 @@ static int load_flat_file(struct linux_binprm * bprm,
                         }
 
                         /* Get the pointer's value.  */
-                        addr = flat_get_addr_from_rp(rp, relval, flags);
+                        addr = flat_get_addr_from_rp(rp, relval, flags, &persistent);
                         if (addr != 0) {
                                 /*
                                  * Do the relocation.  PIC relocs in the data section are
diff --git a/include/asm-h8300/flat.h b/include/asm-h8300/flat.h
index c20eee767d6f..2a873508a9a1 100644
--- a/include/asm-h8300/flat.h
+++ b/include/asm-h8300/flat.h
@@ -9,6 +9,7 @@
 #define flat_argvp_envp_on_stack()              1
 #define flat_old_ram_flag(flags)                1
 #define flat_reloc_valid(reloc, size)           ((reloc) <= (size))
+#define flat_set_persistent(relval, p)          0
 
 /*
  * on the H8 a couple of the relocations have an instruction in the
@@ -18,7 +19,7 @@
  */
 
 #define flat_get_relocate_addr(rel)             (rel)
-#define flat_get_addr_from_rp(rp, relval, flags) \
+#define flat_get_addr_from_rp(rp, relval, flags, persistent) \
         (get_unaligned(rp) & ((flags & FLAT_FLAG_GOTPIC) ? 0xffffffff: 0x00ffffff))
 #define flat_put_addr_at_rp(rp, addr, rel) \
         put_unaligned (((*(char *)(rp)) << 24) | ((addr) & 0x00ffffff), rp)
diff --git a/include/asm-m32r/flat.h b/include/asm-m32r/flat.h
index 1b285f65cab6..d851cf0c4aa5 100644
--- a/include/asm-m32r/flat.h
+++ b/include/asm-m32r/flat.h
@@ -15,9 +15,10 @@
 #define flat_stack_align(sp)            (*sp += (*sp & 3 ? (4 - (*sp & 3)): 0))
 #define flat_argvp_envp_on_stack()              0
 #define flat_old_ram_flag(flags)                (flags)
+#define flat_set_persistent(relval, p)          0
 #define flat_reloc_valid(reloc, size)           \
         (((reloc) - textlen_for_m32r_lo16_data) <= (size))
-#define flat_get_addr_from_rp(rp, relval, flags) \
+#define flat_get_addr_from_rp(rp, relval, flags, persistent) \
         m32r_flat_get_addr_from_rp(rp, relval, (text_len) )
 
 #define flat_put_addr_at_rp(rp, addr, relval) \
diff --git a/include/asm-m68knommu/flat.h b/include/asm-m68knommu/flat.h
index 2d836edc4344..814b5174a8e0 100644
--- a/include/asm-m68knommu/flat.h
+++ b/include/asm-m68knommu/flat.h
@@ -9,8 +9,9 @@
 #define flat_argvp_envp_on_stack()              1
 #define flat_old_ram_flag(flags)                (flags)
 #define flat_reloc_valid(reloc, size)           ((reloc) <= (size))
-#define flat_get_addr_from_rp(rp, relval, flags)        get_unaligned(rp)
+#define flat_get_addr_from_rp(rp, relval, flags, p)     get_unaligned(rp)
 #define flat_put_addr_at_rp(rp, val, relval)    put_unaligned(val,rp)
 #define flat_get_relocate_addr(rel)             (rel)
+#define flat_set_persistent(relval, p)          0
 
 #endif /* __M68KNOMMU_FLAT_H__ */
diff --git a/include/asm-sh/flat.h b/include/asm-sh/flat.h
index 0d5cc04ab005..dc4f5950dafa 100644
--- a/include/asm-sh/flat.h
+++ b/include/asm-sh/flat.h
@@ -16,8 +16,9 @@
 #define flat_argvp_envp_on_stack()              0
 #define flat_old_ram_flag(flags)                (flags)
 #define flat_reloc_valid(reloc, size)           ((reloc) <= (size))
-#define flat_get_addr_from_rp(rp, relval, flags)        get_unaligned(rp)
+#define flat_get_addr_from_rp(rp, relval, flags, p)     get_unaligned(rp)
 #define flat_put_addr_at_rp(rp, val, relval)    put_unaligned(val,rp)
 #define flat_get_relocate_addr(rel)             (rel)
+#define flat_set_persistent(relval, p)          0
 
 #endif /* __ASM_SH_FLAT_H */
diff --git a/include/asm-v850/flat.h b/include/asm-v850/flat.h
index 3888f59d6881..17f0ea566611 100644
--- a/include/asm-v850/flat.h
+++ b/include/asm-v850/flat.h
@@ -25,6 +25,7 @@
 #define flat_stack_align(sp)            /* nothing needed */
 #define flat_argvp_envp_on_stack()      0
 #define flat_old_ram_flag(flags)        (flags)
+#define flat_set_persistent(relval, p)  0
 
 /* We store the type of relocation in the top 4 bits of the `relval.' */
 
@@ -46,7 +47,8 @@ flat_get_relocate_addr (unsigned long relval)
    For the v850, RP should always be half-word aligned.  */
 static inline unsigned long flat_get_addr_from_rp (unsigned long *rp,
                                                    unsigned long relval,
-                                                   unsigned long flags)
+                                                   unsigned long flags,
+                                                   unsigned long *persistent)
 {
         short *srp = (short *)rp;