diff options
Diffstat (limited to 'arch/hexagon/kernel/ptrace.c')
| -rw-r--r-- | arch/hexagon/kernel/ptrace.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/arch/hexagon/kernel/ptrace.c b/arch/hexagon/kernel/ptrace.c new file mode 100644 index 0000000..8fe0349 --- /dev/null +++ b/arch/hexagon/kernel/ptrace.c @@ -0,0 +1,181 @@ +/* + * Ptrace support for Hexagon + * + * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <generated/compile.h> + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/errno.h> +#include <linux/ptrace.h> +#include <linux/regset.h> +#include <linux/user.h> +#include <linux/elf.h> + +#include <asm/system.h> +#include <asm/user.h> + +static int genregs_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + int ret; + unsigned int dummy; + struct pt_regs *regs = task_pt_regs(target); + + + if (!regs) + return -EIO; + + /* The general idea here is that the copyout must happen in + * exactly the same order in which the userspace expects these + * regs. Now, the sequence in userspace does not match the + * sequence in the kernel, so everything past the 32 gprs + * happens one at a time. + */ + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, + ®s->r00, 0, 32*sizeof(unsigned long)); + +#define ONEXT(KPT_REG, USR_REG) \ + if (!ret) \ + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, \ + KPT_REG, offsetof(struct user_regs_struct, USR_REG), \ + offsetof(struct user_regs_struct, USR_REG) + \ + sizeof(unsigned long)); + + /* Must be exactly same sequence as struct user_regs_struct */ + ONEXT(®s->sa0, sa0); + ONEXT(®s->lc0, lc0); + ONEXT(®s->sa1, sa1); + ONEXT(®s->lc1, lc1); + ONEXT(®s->m0, m0); + ONEXT(®s->m1, m1); + ONEXT(®s->usr, usr); + ONEXT(®s->preds, p3_0); + ONEXT(®s->gp, gp); + ONEXT(®s->ugp, ugp); + ONEXT(&pt_elr(regs), pc); + dummy = pt_cause(regs); + ONEXT(&dummy, cause); + ONEXT(&pt_badva(regs), badva); + + /* Pad the rest with zeros, if needed */ + if (!ret) + ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, + offsetof(struct user_regs_struct, pad1), -1); + return ret; +} + +static int genregs_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int ret; + unsigned long bucket; + struct pt_regs *regs = task_pt_regs(target); + + if (!regs) + return -EIO; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + ®s->r00, 0, 32*sizeof(unsigned long)); + +#define INEXT(KPT_REG, USR_REG) \ + if (!ret) \ + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ + KPT_REG, offsetof(struct user_regs_struct, USR_REG), \ + offsetof(struct user_regs_struct, USR_REG) + \ + sizeof(unsigned long)); + + /* Must be exactly same sequence as struct user_regs_struct */ + INEXT(®s->sa0, sa0); + INEXT(®s->lc0, lc0); + INEXT(®s->sa1, sa1); + INEXT(®s->lc1, lc1); + INEXT(®s->m0, m0); + INEXT(®s->m1, m1); + INEXT(®s->usr, usr); + INEXT(®s->preds, p3_0); + INEXT(®s->gp, gp); + INEXT(®s->ugp, ugp); + INEXT(&pt_elr(regs), pc); + + /* CAUSE and BADVA aren't writeable. */ + INEXT(&bucket, cause); + INEXT(&bucket, badva); + + /* Ignore the rest, if needed */ + if (!ret) + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + offsetof(struct user_regs_struct, pad1), -1); + + if (ret) + return ret; + + /* + * This is special; SP is actually restored by the VM via the + * special event record which is set by the special trap. + */ + regs->hvmer.vmpsp = regs->r29; + return 0; +} + +enum hexagon_regset { + REGSET_GENERAL, +}; + +static const struct user_regset hexagon_regsets[] = { + [REGSET_GENERAL] = { + .core_note_type = NT_PRSTATUS, + .n = ELF_NGREG, + .size = sizeof(unsigned long), + .align = sizeof(unsigned long), + .get = genregs_get, + .set = genregs_set, + }, +}; + +static const struct user_regset_view hexagon_user_view = { + .name = UTS_MACHINE, + .e_machine = ELF_ARCH, + .ei_osabi = ELF_OSABI, + .regsets = hexagon_regsets, + .n = ARRAY_SIZE(hexagon_regsets) +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ + return &hexagon_user_view; +} + +void ptrace_disable(struct task_struct *child) +{ + /* Boilerplate - resolves to null inline if no HW single-step */ + user_disable_single_step(child); +} + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + return ptrace_request(child, request, addr, data); +} |