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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: Paul Mundt <lethal@linux-sh.org>
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@ -240,6 +240,29 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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}
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break;
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}
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#endif
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#ifdef CONFIG_BINFMT_ELF_FDPIC
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case PTRACE_GETFDPIC: {
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unsigned long tmp = 0;
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switch (addr) {
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case PTRACE_GETFDPIC_EXEC:
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tmp = child->mm->context.exec_fdpic_loadmap;
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break;
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case PTRACE_GETFDPIC_INTERP:
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tmp = child->mm->context.interp_fdpic_loadmap;
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break;
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default:
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break;
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}
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ret = 0;
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if (put_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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break;
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}
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#endif
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default:
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ret = ptrace_request(child, request, addr, data);
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@ -33,6 +33,11 @@
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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struct fdpic_func_descriptor {
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unsigned long text;
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unsigned long GOT;
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};
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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@ -378,7 +383,15 @@ static int setup_frame(int sig, struct k_sigaction *ka,
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regs->regs[4] = signal; /* Arg for signal handler */
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regs->regs[5] = 0;
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regs->regs[6] = (unsigned long) &frame->sc;
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regs->pc = (unsigned long) ka->sa.sa_handler;
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if (current->personality & FDPIC_FUNCPTRS) {
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struct fdpic_func_descriptor __user *funcptr =
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(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
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__get_user(regs->pc, &funcptr->text);
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__get_user(regs->regs[12], &funcptr->GOT);
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} else
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regs->pc = (unsigned long)ka->sa.sa_handler;
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set_fs(USER_DS);
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@ -458,7 +471,15 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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regs->regs[4] = signal; /* Arg for signal handler */
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regs->regs[5] = (unsigned long) &frame->info;
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regs->regs[6] = (unsigned long) &frame->uc;
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regs->pc = (unsigned long) ka->sa.sa_handler;
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if (current->personality & FDPIC_FUNCPTRS) {
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struct fdpic_func_descriptor __user *funcptr =
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(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
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__get_user(regs->pc, &funcptr->text);
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__get_user(regs->regs[12], &funcptr->GOT);
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} else
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regs->pc = (unsigned long)ka->sa.sa_handler;
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set_fs(USER_DS);
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@ -30,7 +30,7 @@ config COMPAT_BINFMT_ELF
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config BINFMT_ELF_FDPIC
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bool "Kernel support for FDPIC ELF binaries"
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default y
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depends on (FRV || BLACKFIN)
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depends on (FRV || BLACKFIN || (SUPERH32 && !MMU))
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help
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ELF FDPIC binaries are based on ELF, but allow the individual load
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segments of a binary to be located in memory independently of each
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@ -1,10 +1,15 @@
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#ifndef __ASM_SH_ELF_H
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#define __ASM_SH_ELF_H
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#include <linux/utsname.h>
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#include <asm/auxvec.h>
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#include <asm/ptrace.h>
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#include <asm/user.h>
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/* ELF header e_flags defines */
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#define EF_SH_PIC 0x100 /* -fpic */
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#define EF_SH_FDPIC 0x8000 /* -mfdpic */
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/* SH (particularly SHcompact) relocation types */
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#define R_SH_NONE 0
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#define R_SH_DIR32 1
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@ -43,6 +48,28 @@
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#define R_SH_RELATIVE 165
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#define R_SH_GOTOFF 166
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#define R_SH_GOTPC 167
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/* FDPIC relocs */
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#define R_SH_GOT20 70
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#define R_SH_GOTOFF20 71
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#define R_SH_GOTFUNCDESC 72
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#define R_SH_GOTFUNCDESC20 73
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#define R_SH_GOTOFFFUNCDESC 74
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#define R_SH_GOTOFFFUNCDESC20 75
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#define R_SH_FUNCDESC 76
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#define R_SH_FUNCDESC_VALUE 77
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#if 0 /* XXX - later .. */
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#define R_SH_GOT20 198
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#define R_SH_GOTOFF20 199
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#define R_SH_GOTFUNCDESC 200
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#define R_SH_GOTFUNCDESC20 201
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#define R_SH_GOTOFFFUNCDESC 202
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#define R_SH_GOTOFFFUNCDESC20 203
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#define R_SH_FUNCDESC 204
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#define R_SH_FUNCDESC_VALUE 205
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#endif
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/* SHmedia relocs */
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#define R_SH_IMM_LOW16 246
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#define R_SH_IMM_LOW16_PCREL 247
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@ -77,9 +104,12 @@ typedef struct user_fpu_struct elf_fpregset_t;
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) ( (x)->e_machine == EM_SH )
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#define elf_check_arch(x) ((x)->e_machine == EM_SH)
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#define elf_check_fdpic(x) ((x)->e_flags & EF_SH_FDPIC)
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#define elf_check_const_displacement(x) ((x)->e_flags & EF_SH_PIC)
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#define USE_ELF_CORE_DUMP
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#define ELF_FDPIC_CORE_EFLAGS EF_SH_FDPIC
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#define ELF_EXEC_PAGESIZE PAGE_SIZE
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/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
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@ -136,6 +166,27 @@ typedef struct user_fpu_struct elf_fpregset_t;
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_r->regs[8]=0; _r->regs[9]=0; _r->regs[10]=0; _r->regs[11]=0; \
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_r->regs[12]=0; _r->regs[13]=0; _r->regs[14]=0; \
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_r->sr = SR_FD; } while (0)
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#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, \
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_dynamic_addr) \
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do { \
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_r->regs[0] = 0; \
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_r->regs[1] = 0; \
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_r->regs[2] = 0; \
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_r->regs[3] = 0; \
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_r->regs[4] = 0; \
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_r->regs[5] = 0; \
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_r->regs[6] = 0; \
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_r->regs[7] = 0; \
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_r->regs[8] = _exec_map_addr; \
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_r->regs[9] = _interp_map_addr; \
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_r->regs[10] = _dynamic_addr; \
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_r->regs[11] = 0; \
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_r->regs[12] = 0; \
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_r->regs[13] = 0; \
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_r->regs[14] = 0; \
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_r->sr = SR_FD; \
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} while (0)
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#endif
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#define SET_PERSONALITY(ex, ibcs2) set_personality(PER_LINUX_32BIT)
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@ -12,6 +12,10 @@ typedef struct {
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struct vm_list_struct *vmlist;
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unsigned long end_brk;
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#endif
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#ifdef CONFIG_BINFMT_ELF_FDPIC
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unsigned long exec_fdpic_loadmap;
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unsigned long interp_fdpic_loadmap;
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#endif
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} mm_context_t;
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/*
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@ -87,6 +87,11 @@ struct pt_dspregs {
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unsigned long mod;
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};
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#define PTRACE_GETFDPIC 31 /* get the ELF fdpic loadmap address */
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#define PTRACE_GETFDPIC_EXEC 0 /* [addr] request the executable loadmap */
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#define PTRACE_GETFDPIC_INTERP 1 /* [addr] request the interpreter loadmap */
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#define PTRACE_GETDSPREGS 55
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#define PTRACE_SETDSPREGS 56
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#endif
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