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Commit 3bc24a1a authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Initial ELF FDPIC support. 

This adds initial support for ELF FDPIC on MMU-less SH, as per version
0.2 of the ABI definition at:

	http://www.codesourcery.com/public/docs/sh-fdpic/sh-fdpic-abi.txt



Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 9b14ec35

arch/sh/kernel/ptrace_32.c

+23 −0
Original line number Diff line number Diff line
@@ -240,6 +240,29 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		}

		break;

	}

#endif

#ifdef CONFIG_BINFMT_ELF_FDPIC

	case PTRACE_GETFDPIC: {

		unsigned long tmp = 0;



		switch (addr) {

		case PTRACE_GETFDPIC_EXEC:

			tmp = child->mm->context.exec_fdpic_loadmap;

			break;

		case PTRACE_GETFDPIC_INTERP:

			tmp = child->mm->context.interp_fdpic_loadmap;

			break;

		default:

			break;

		}



		ret = 0;

		if (put_user(tmp, (unsigned long *) data)) {

			ret = -EFAULT;

			break;

		}

		break;

	}

#endif

	default:

		ret = ptrace_request(child, request, addr, data);

arch/sh/kernel/signal_32.c

+23 −2
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ 


#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))



struct fdpic_func_descriptor {

	unsigned long	text;

	unsigned long	GOT;

};



/*

 * Atomically swap in the new signal mask, and wait for a signal.

 */
@@ -378,6 +383,14 @@ static int setup_frame(int sig, struct k_sigaction *ka, 
	regs->regs[4] = signal; /* Arg for signal handler */

	regs->regs[5] = 0;

	regs->regs[6] = (unsigned long) &frame->sc;



	if (current->personality & FDPIC_FUNCPTRS) {

		struct fdpic_func_descriptor __user *funcptr =

			(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;



		__get_user(regs->pc, &funcptr->text);

		__get_user(regs->regs[12], &funcptr->GOT);

	} else

		regs->pc = (unsigned long)ka->sa.sa_handler;



	set_fs(USER_DS);
@@ -458,6 +471,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, 
	regs->regs[4] = signal; /* Arg for signal handler */

	regs->regs[5] = (unsigned long) &frame->info;

	regs->regs[6] = (unsigned long) &frame->uc;



	if (current->personality & FDPIC_FUNCPTRS) {

		struct fdpic_func_descriptor __user *funcptr =

			(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;



		__get_user(regs->pc, &funcptr->text);

		__get_user(regs->regs[12], &funcptr->GOT);

	} else

		regs->pc = (unsigned long)ka->sa.sa_handler;



	set_fs(USER_DS);

fs/Kconfig.binfmt

+1 −1
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ config COMPAT_BINFMT_ELF 
config BINFMT_ELF_FDPIC

	bool "Kernel support for FDPIC ELF binaries"

	default y

	depends on (FRV || BLACKFIN)

	depends on (FRV || BLACKFIN || (SUPERH32 && !MMU))

	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

include/asm-sh/elf.h

+52 −1
Original line number Diff line number Diff line 
#ifndef __ASM_SH_ELF_H

#define __ASM_SH_ELF_H



#include <linux/utsname.h>

#include <asm/auxvec.h>

#include <asm/ptrace.h>

#include <asm/user.h>



/* ELF header e_flags defines */

#define EF_SH_PIC		0x100	/* -fpic */

#define EF_SH_FDPIC		0x8000	/* -mfdpic */



/* SH (particularly SHcompact) relocation types  */

#define	R_SH_NONE		0

#define	R_SH_DIR32		1
@@ -43,6 +48,28 @@ 
#define	R_SH_RELATIVE		165

#define	R_SH_GOTOFF		166

#define	R_SH_GOTPC		167



/* FDPIC relocs */

#define R_SH_GOT20		70

#define R_SH_GOTOFF20		71

#define R_SH_GOTFUNCDESC	72

#define R_SH_GOTFUNCDESC20	73

#define R_SH_GOTOFFFUNCDESC	74

#define R_SH_GOTOFFFUNCDESC20	75

#define R_SH_FUNCDESC		76

#define R_SH_FUNCDESC_VALUE	77



#if 0 /* XXX - later .. */

#define R_SH_GOT20		198

#define R_SH_GOTOFF20		199

#define R_SH_GOTFUNCDESC	200

#define R_SH_GOTFUNCDESC20	201

#define R_SH_GOTOFFFUNCDESC	202

#define R_SH_GOTOFFFUNCDESC20	203

#define R_SH_FUNCDESC		204

#define R_SH_FUNCDESC_VALUE	205

#endif



/* SHmedia relocs */

#define R_SH_IMM_LOW16		246

#define R_SH_IMM_LOW16_PCREL	247
@@ -78,8 +105,11 @@ typedef struct user_fpu_struct elf_fpregset_t; 
 * This is used to ensure we don't load something for the wrong architecture.

 */

#define elf_check_arch(x)		((x)->e_machine == EM_SH)

#define elf_check_fdpic(x)		((x)->e_flags & EF_SH_FDPIC)

#define elf_check_const_displacement(x)	((x)->e_flags & EF_SH_PIC)



#define USE_ELF_CORE_DUMP

#define ELF_FDPIC_CORE_EFLAGS	EF_SH_FDPIC

#define ELF_EXEC_PAGESIZE	PAGE_SIZE



/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
@@ -136,6 +166,27 @@ typedef struct user_fpu_struct elf_fpregset_t; 
       _r->regs[8]=0; _r->regs[9]=0; _r->regs[10]=0; _r->regs[11]=0; \

       _r->regs[12]=0; _r->regs[13]=0; _r->regs[14]=0; \

       _r->sr = SR_FD; } while (0)



#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr,	\

			    _dynamic_addr)				\

do {									\

	_r->regs[0]	= 0;						\

	_r->regs[1]	= 0;						\

	_r->regs[2]	= 0;						\

	_r->regs[3]	= 0;						\

	_r->regs[4]	= 0;						\

	_r->regs[5]	= 0;						\

	_r->regs[6]	= 0;						\

	_r->regs[7]	= 0;						\

	_r->regs[8]	= _exec_map_addr;				\

	_r->regs[9]	= _interp_map_addr;				\

	_r->regs[10]	= _dynamic_addr;				\

	_r->regs[11]	= 0;						\

	_r->regs[12]	= 0;						\

	_r->regs[13]	= 0;						\

	_r->regs[14]	= 0;						\

	_r->sr		= SR_FD;					\

} while (0)

#endif



#define SET_PERSONALITY(ex, ibcs2) set_personality(PER_LINUX_32BIT)

include/asm-sh/mmu.h

+4 −0
Original line number Diff line number Diff line
@@ -12,6 +12,10 @@ typedef struct { 
	struct vm_list_struct	*vmlist;

	unsigned long		end_brk;

#endif

#ifdef CONFIG_BINFMT_ELF_FDPIC

	unsigned long		exec_fdpic_loadmap;

	unsigned long		interp_fdpic_loadmap;

#endif

} mm_context_t;



/*