C6X: add support to build with BINFMT_ELF_FDPIC

C6x userspace supports a shared library mechanism called DSBT for systems with
no MMU. DSBT is similar to FDPIC in allowing shared text segments and private
copies of data segments without an MMU. Both methods access data using a base
register and offset. With FDPIC, the caller of an external function sets up the
base register for the callee. With DSBT, the called function sets up its own
base register. Other details differ but both userspaces need the same thing
from the kernel loader: a map of where each ELF segment was loaded. The FDPIC
loader already provides this, so DSBT just uses it.

This patch enables BINFMT_ELF_FDPIC by default for C6X and provides the
necessary architecture hooks for the generic loader.

Signed-off-by: Mark Salter <msalter@redhat.com>

4 files changed, 23 insertions, 2 deletions

diff --git a/arch/c6x/include/asm/elf.h b/arch/c6x/include/asm/elf.h
index d57865ba2c44..f4552db20b4a 100644
--- a/arch/c6x/include/asm/elf.h
+++ b/arch/c6x/include/asm/elf.h
@@ -30,7 +30,19 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  */
 #define elf_check_arch(x) ((x)->e_machine == EM_TI_C6000)
 
-#define elf_check_const_displacement(x) (1)
+#define elf_check_fdpic(x) (1)
+#define elf_check_const_displacement(x) (0)
+
+#define ELF_FDPIC_PLAT_INIT(_regs, _exec_map, _interp_map, _dynamic_addr) \
+do {                                                            \
+        _regs->b4       = (_exec_map);                          \
+        _regs->a6       = (_interp_map);                        \
+        _regs->b6       = (_dynamic_addr);                      \
+} while (0)
+
+#define ELF_FDPIC_CORE_EFLAGS   0
+
+#define ELF_CORE_COPY_FPREGS(...) 0 /* No FPU regs to copy */
 
 /*
  * These are used to set parameters in the core dumps.
diff --git a/arch/c6x/include/asm/mmu.h b/arch/c6x/include/asm/mmu.h
index 41592bf16067..4467e770a1ce 100644
--- a/arch/c6x/include/asm/mmu.h
+++ b/arch/c6x/include/asm/mmu.h
@@ -13,6 +13,10 @@
 
 typedef struct {
         unsigned long           end_brk;
+#ifdef CONFIG_BINFMT_ELF_FDPIC
+        unsigned long   exec_fdpic_loadmap;
+        unsigned long   interp_fdpic_loadmap;
+#endif
 } mm_context_t;
 
 #endif /* _ASM_C6X_MMU_H */
diff --git a/arch/c6x/include/asm/ptrace.h b/arch/c6x/include/asm/ptrace.h
index 21e8d7931fe7..b04ff5964258 100644
--- a/arch/c6x/include/asm/ptrace.h
+++ b/arch/c6x/include/asm/ptrace.h
@@ -97,6 +97,11 @@
 #define PT_DP      PT_B14  /* Data Segment Pointer (B14) */
 #define PT_SP      PT_B15  /* Stack Pointer (B15)  */
 
+#define PTRACE_GETFDPIC         31      /* get the ELF fdpic loadmap address */
+
+#define PTRACE_GETFDPIC_EXEC    0       /* [addr] request the executable loadmap */
+#define PTRACE_GETFDPIC_INTERP  1       /* [addr] request the interpreter loadmap */
+
 #ifndef __ASSEMBLY__
 
 #ifdef _BIG_ENDIAN
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index e95d1b64082c..022574202749 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -33,7 +33,7 @@ config ARCH_BINFMT_ELF_RANDOMIZE_PIE
 config BINFMT_ELF_FDPIC
         bool "Kernel support for FDPIC ELF binaries"
         default y
-        depends on (FRV || BLACKFIN || (SUPERH32 && !MMU))
+        depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
         help
           ELF FDPIC binaries are based on ELF, but allow the individual load
           segments of a binary to be located in memory independently of each