82c1c11bdd
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c. Also s390 debug registers need to be updated, when singlestepping is switched on / off. Thus, setting/resetting of singlestepping is centralized in the new function set_singlestep(), which also inserts the macro SUBARCH_SET_SINGLESTEP(mode), if defined. Finally, s390 has the "ieee_instruction_pointer" in its registers, which also is allowed to be read via ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0); To implement this feature, sys_ptrace inserts the macro SUBARCH_PTRACE_SPECIAL, if defined. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
183 lines
3.9 KiB
C
183 lines
3.9 KiB
C
/*
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* Copyright 2003 PathScale, Inc.
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*
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* Licensed under the GPL
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*/
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#define __FRAME_OFFSETS
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#include "asm/ptrace.h"
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#include "linux/sched.h"
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#include "linux/errno.h"
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#include "asm/elf.h"
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/* XXX x86_64 */
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unsigned long not_ss;
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unsigned long not_ds;
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unsigned long not_es;
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#define SC_SS(r) (not_ss)
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#define SC_DS(r) (not_ds)
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#define SC_ES(r) (not_es)
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/* determines which flags the user has access to. */
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/* 1 = access 0 = no access */
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#define FLAG_MASK 0x44dd5UL
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int putreg(struct task_struct *child, int regno, unsigned long value)
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{
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unsigned long tmp;
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#ifdef TIF_IA32
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/* Some code in the 64bit emulation may not be 64bit clean.
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Don't take any chances. */
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if (test_tsk_thread_flag(child, TIF_IA32))
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value &= 0xffffffff;
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#endif
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switch (regno){
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case FS:
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case GS:
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case DS:
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case ES:
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case SS:
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case CS:
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if (value && (value & 3) != 3)
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return -EIO;
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value &= 0xffff;
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break;
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case FS_BASE:
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case GS_BASE:
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if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
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return -EIO;
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break;
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case EFLAGS:
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value &= FLAG_MASK;
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tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
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value |= tmp;
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break;
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}
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PT_REGS_SET(&child->thread.regs, regno, value);
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return 0;
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}
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int poke_user(struct task_struct *child, long addr, long data)
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{
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if ((addr & 3) || addr < 0)
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return -EIO;
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if (addr < MAX_REG_OFFSET)
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return putreg(child, addr, data);
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#if 0 /* Need x86_64 debugregs handling */
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else if((addr >= offsetof(struct user, u_debugreg[0])) &&
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(addr <= offsetof(struct user, u_debugreg[7]))){
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addr -= offsetof(struct user, u_debugreg[0]);
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addr = addr >> 2;
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if((addr == 4) || (addr == 5)) return -EIO;
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child->thread.arch.debugregs[addr] = data;
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return 0;
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}
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#endif
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return -EIO;
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}
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unsigned long getreg(struct task_struct *child, int regno)
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{
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unsigned long retval = ~0UL;
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switch (regno) {
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case FS:
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case GS:
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case DS:
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case ES:
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case SS:
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case CS:
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retval = 0xffff;
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/* fall through */
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default:
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retval &= PT_REG(&child->thread.regs, regno);
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#ifdef TIF_IA32
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if (test_tsk_thread_flag(child, TIF_IA32))
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retval &= 0xffffffff;
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#endif
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}
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return retval;
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}
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int peek_user(struct task_struct *child, long addr, long data)
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{
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/* read the word at location addr in the USER area. */
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unsigned long tmp;
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if ((addr & 3) || addr < 0)
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return -EIO;
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tmp = 0; /* Default return condition */
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if(addr < MAX_REG_OFFSET){
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tmp = getreg(child, addr);
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}
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#if 0 /* Need x86_64 debugregs handling */
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else if((addr >= offsetof(struct user, u_debugreg[0])) &&
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(addr <= offsetof(struct user, u_debugreg[7]))){
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addr -= offsetof(struct user, u_debugreg[0]);
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addr = addr >> 2;
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tmp = child->thread.arch.debugregs[addr];
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}
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#endif
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return put_user(tmp, (unsigned long *) data);
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}
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void arch_switch(void)
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{
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/* XXX
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printk("arch_switch\n");
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*/
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}
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int is_syscall(unsigned long addr)
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{
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panic("is_syscall");
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}
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
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{
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panic("dump_fpu");
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return(1);
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}
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int get_fpregs(unsigned long buf, struct task_struct *child)
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{
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panic("get_fpregs");
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return(0);
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}
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int set_fpregs(unsigned long buf, struct task_struct *child)
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{
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panic("set_fpregs");
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return(0);
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}
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int get_fpxregs(unsigned long buf, struct task_struct *tsk)
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{
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panic("get_fpxregs");
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return(0);
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}
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int set_fpxregs(unsigned long buf, struct task_struct *tsk)
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{
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panic("set_fxpregs");
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return(0);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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