Will look at the more generic ptrace support in the future. Signed-off-by: Richard Kuo Signed-off-by: Linas Vepstas --- arch/hexagon/include/asm/ptrace.h | 46 +++++ arch/hexagon/kernel/ptrace.c | 333 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 379 insertions(+) Index: linux-hexagon-kernel/arch/hexagon/include/asm/ptrace.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-hexagon-kernel/arch/hexagon/include/asm/ptrace.h 2011-09-03 20:14:59.684981279 -0500 @@ -0,0 +1,46 @@ +/* + * Ptrace definitions for the Hexagon architecture + * + * 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. + */ + +#ifndef _ASM_PTRACE_H +#define _ASM_PTRACE_H + +#include + +/* arch_ptrace and ptrace_disable use task_struct in arg lists */ +struct task_struct; + +/* + * ptrace commands not part of Linux base set (but common to essentially + * all supported architectures). + */ + +#define PTRACE_GETREGS 12 +#define PTRACE_SETREGS 13 + +#define N_PTRACE_REGS 44 + +#define profile_pc(regs) instruction_pointer(regs) +#define instruction_pointer(regs) pt_elr(regs) + +/* kprobe-based event tracer support */ +extern int regs_query_register_offset(const char *name); +extern const char *regs_query_register_name(unsigned int offset); + +#endif Index: linux-hexagon-kernel/arch/hexagon/kernel/ptrace.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-hexagon-kernel/arch/hexagon/kernel/ptrace.c 2011-09-07 13:00:31.110647061 -0500 @@ -0,0 +1,333 @@ +/* + * 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 + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +struct pt_regs_offset { + const char *name; + int offset; +}; + +#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} +#define REG_OFFSET_HVM_NAME(r, s) {.name = #r, \ + .offset = offsetof(struct pt_regs, s)} +#define REG_OFFSET_END {.name = NULL, .offset = 0} + +static const struct pt_regs_offset regoffset_table[] = { + REG_OFFSET_NAME(r00), + REG_OFFSET_NAME(r01), + REG_OFFSET_NAME(r02), + REG_OFFSET_NAME(r03), + REG_OFFSET_NAME(r04), + REG_OFFSET_NAME(r05), + REG_OFFSET_NAME(r06), + REG_OFFSET_NAME(r07), + REG_OFFSET_NAME(r08), + REG_OFFSET_NAME(r09), + + REG_OFFSET_NAME(r10), + REG_OFFSET_NAME(r11), + REG_OFFSET_NAME(r12), + REG_OFFSET_NAME(r13), + REG_OFFSET_NAME(r14), + REG_OFFSET_NAME(r15), + REG_OFFSET_NAME(r16), + REG_OFFSET_NAME(r17), + REG_OFFSET_NAME(r18), + REG_OFFSET_NAME(r19), + + REG_OFFSET_NAME(r20), + REG_OFFSET_NAME(r21), + REG_OFFSET_NAME(r22), + REG_OFFSET_NAME(r23), + REG_OFFSET_NAME(r24), + REG_OFFSET_NAME(r25), + REG_OFFSET_NAME(r26), + REG_OFFSET_NAME(r27), + REG_OFFSET_NAME(r28), + REG_OFFSET_NAME(r29), + + REG_OFFSET_NAME(r30), + REG_OFFSET_NAME(r31), + + REG_OFFSET_NAME(gp), + REG_OFFSET_NAME(ugp), + REG_OFFSET_NAME(sa0), + REG_OFFSET_NAME(lc0), + REG_OFFSET_NAME(sa1), + REG_OFFSET_NAME(lc1), + REG_OFFSET_NAME(m0), + REG_OFFSET_NAME(m1), + REG_OFFSET_NAME(preds), + REG_OFFSET_HVM_NAME(pc, hvmer.vmel), + REG_OFFSET_HVM_NAME(cause, hvmer.vmest), + REG_OFFSET_HVM_NAME(badva, hvmer.vmbadva), +}; + +/** + * regs_query_register_offset() - query register offset from its name + * @name: the name of a register + * + * regs_query_register_offset() returns the offset of a register in struct + * pt_regs from its name. If the name is invalid, this returns -EINVAL; + */ +int regs_query_register_offset(const char *name) +{ + const struct pt_regs_offset *roff; + for (roff = regoffset_table; roff->name != NULL; roff++) + if (!strcmp(roff->name, name)) + return roff->offset; + return -EINVAL; +} + +/** + * regs_query_register_name() - query register name from its offset + * @offset: the offset of a register in struct pt_regs. + * + * regs_query_register_name() returns the name of a register from its + * offset in struct pt_regs. If the @offset is invalid, this returns NULL; + */ +const char *regs_query_register_name(unsigned int offset) +{ + const struct pt_regs_offset *roff; + for (roff = regoffset_table; roff->name != NULL; roff++) + if (roff->offset == offset) + return roff->name; + return NULL; +} + +static int gpr_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->gp, gp); + ONEXT(®s->ugp, ugp); + 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->preds, p3_0); + 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, + sizeof(struct user_regs_struct), -1); + return ret; +} + +static int gpr_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->gp, gp); + INEXT(®s->ugp, ugp); + 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->preds, p3_0); + 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, + sizeof(struct user_regs_struct), -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_GPR, +}; + +static const struct user_regset hexagon_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, + .n = N_PTRACE_REGS, + .size = sizeof(unsigned long), + .align = sizeof(unsigned long), + .get = gpr_get, + .set = gpr_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) +}; + +static int ptrace_pokeusr(struct task_struct *target, int regnum, + unsigned long data) +{ + struct pt_regs *regs = task_pt_regs(target); + + if (!regs || (regnum < 0)) + return -EIO; + + if (regnum < 32) { + unsigned long *p = ®s->r00; + *(p+regnum) = data; + + /* Return happens via HVM */ + if (regnum == 29) + regs->hvmer.vmpsp = regs->r29; + return 0; + } + +/* + * Todo: sync up with gdb on register passing numbering. + */ + +#define SETREG(KPT_REG, USR_REG) \ + case offsetof(struct user_regs_struct, USR_REG)>>2: \ + KPT_REG = data; \ + return 0; + + /* Other regs are scattered about */ + switch (regnum) { + SETREG(regs->gp, gp); + SETREG(regs->ugp, ugp); + SETREG(regs->sa0, sa0); + SETREG(regs->lc0, lc0); + SETREG(regs->sa1, sa1); + SETREG(regs->lc1, lc1); + SETREG(regs->m0, m0); + SETREG(regs->m1, m1); + SETREG(regs->preds, p3_0); + SETREG(pt_elr(regs), pc); + } + + /* CAUSE and BADVA aren't writeable. */ + return -EINVAL; +} + +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) +{ + void __user *udata = (void __user *) data; + + switch (request) { + case PTRACE_POKETEXT: /* write the word at location addr. */ + case PTRACE_POKEDATA: + return generic_ptrace_pokedata(child, addr, data); + case PTRACE_POKEUSR: /* write register specified by addr. */ + return ptrace_pokeusr(child, addr, data); + case PTRACE_GETREGS: + return copy_regset_to_user(child, &hexagon_user_view, + REGSET_GPR, 0, + sizeof(struct user_regs_struct), + udata); + case PTRACE_SETREGS: + return copy_regset_from_user(child, &hexagon_user_view, + REGSET_GPR, 0, + sizeof(struct user_regs_struct), + udata); + default: + return ptrace_request(child, request, addr, data); + } + + return 0; +} -- Sent by an employee of the Qualcomm Innovation Center, Inc. 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