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Date: Wed, 19 Sep 2007 21:31:09 -0400
From: Robin Getz <rgetz@...ckfin.uclinux.org>
To: uclinux-dist-devel@...ckfin.uclinux.org, bryan.wu@...log.com
Cc: "Bernd Schmidt" <bernd.schmidt@...log.com>,
"David McCullough" <davidm@...pgear.com>,
"Greg Ungerer" <gerg@...pgear.com>,
"Linux Kernel" <linux-kernel@...r.kernel.org>,
"Andrew Morton" <akpm@...ux-foundation.org>,
ysato@...rs.sourceforge.jp, lethal@...ux-sh.org,
miles@....nec.co.jp, linux-m32r@...linux-m32r.org
Subject: Re: [PATCH] binfmt_flat: minimum support for theBlackfin relocations
On Tue 18 Sep 2007 04:09, Bryan Wu pondered:
> From: Bernd Schmidt <bernd.schmidt@...log.com>
>
> This just adds 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.
>
> Signed-off-by: Bernd Schmidt <bernd.schmidt@...log.com>
> Signed-off-by: Bryan Wu <bryan.wu@...log.com>
> Cc: David McCullough <davidm@...pgear.com>
> Cc: Greg Ungerer <gerg@...pgear.com>
Adding the other appropriate maintainers. for h8, m32r, sh and v850.
> ---
> fs/binfmt_flat.c | 5 ++++-
> include/asm-h8300/flat.h | 3 ++-
> include/asm-m32r/flat.h | 3 ++-
> include/asm-m68knommu/flat.h | 3 ++-
> include/asm-sh/flat.h | 3 ++-
> include/asm-v850/flat.h | 4 +++-
> 6 files changed, 15 insertions(+), 6 deletions(-)
> diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
> index 7b0265d..13b58f8 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 c20eee7..2a87350 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 1b285f6..d851cf0 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 2d836ed..814b517 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 0d5cc04..dc4f595 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 3888f59..17f0ea5 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;
-
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