C6X: ptrace support
Original port to early 2.6 kernel using TI COFF toolchain. Brought up to date by Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
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Aurelien Jacquiot
Mark Salter
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commit
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174
arch/c6x/include/asm/ptrace.h
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174
arch/c6x/include/asm/ptrace.h
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/*
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* Copyright (C) 2004, 2006, 2009, 2010 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* Updated for 2.6.34: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_PTRACE_H
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#define _ASM_C6X_PTRACE_H
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#define BKPT_OPCODE 0x56454314 /* illegal opcode */
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#ifdef _BIG_ENDIAN
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#define PT_LO(odd, even) odd
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#define PT_HI(odd, even) even
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#else
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#define PT_LO(odd, even) even
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#define PT_HI(odd, even) odd
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#endif
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#define PT_A4_ORG PT_LO(1, 0)
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#define PT_TSR PT_HI(1, 0)
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#define PT_ILC PT_LO(3, 2)
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#define PT_RILC PT_HI(3, 2)
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#define PT_CSR PT_LO(5, 4)
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#define PT_PC PT_HI(5, 4)
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#define PT_B16 PT_LO(7, 6)
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#define PT_B17 PT_HI(7, 6)
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#define PT_B18 PT_LO(9, 8)
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#define PT_B19 PT_HI(9, 8)
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#define PT_B20 PT_LO(11, 10)
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#define PT_B21 PT_HI(11, 10)
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#define PT_B22 PT_LO(13, 12)
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#define PT_B23 PT_HI(13, 12)
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#define PT_B24 PT_LO(15, 14)
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#define PT_B25 PT_HI(15, 14)
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#define PT_B26 PT_LO(17, 16)
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#define PT_B27 PT_HI(17, 16)
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#define PT_B28 PT_LO(19, 18)
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#define PT_B29 PT_HI(19, 18)
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#define PT_B30 PT_LO(21, 20)
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#define PT_B31 PT_HI(21, 20)
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#define PT_B0 PT_LO(23, 22)
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#define PT_B1 PT_HI(23, 22)
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#define PT_B2 PT_LO(25, 24)
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#define PT_B3 PT_HI(25, 24)
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#define PT_B4 PT_LO(27, 26)
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#define PT_B5 PT_HI(27, 26)
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#define PT_B6 PT_LO(29, 28)
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#define PT_B7 PT_HI(29, 28)
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#define PT_B8 PT_LO(31, 30)
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#define PT_B9 PT_HI(31, 30)
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#define PT_B10 PT_LO(33, 32)
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#define PT_B11 PT_HI(33, 32)
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#define PT_B12 PT_LO(35, 34)
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#define PT_B13 PT_HI(35, 34)
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#define PT_A16 PT_LO(37, 36)
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#define PT_A17 PT_HI(37, 36)
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#define PT_A18 PT_LO(39, 38)
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#define PT_A19 PT_HI(39, 38)
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#define PT_A20 PT_LO(41, 40)
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#define PT_A21 PT_HI(41, 40)
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#define PT_A22 PT_LO(43, 42)
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#define PT_A23 PT_HI(43, 42)
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#define PT_A24 PT_LO(45, 44)
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#define PT_A25 PT_HI(45, 44)
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#define PT_A26 PT_LO(47, 46)
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#define PT_A27 PT_HI(47, 46)
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#define PT_A28 PT_LO(49, 48)
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#define PT_A29 PT_HI(49, 48)
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#define PT_A30 PT_LO(51, 50)
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#define PT_A31 PT_HI(51, 50)
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#define PT_A0 PT_LO(53, 52)
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#define PT_A1 PT_HI(53, 52)
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#define PT_A2 PT_LO(55, 54)
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#define PT_A3 PT_HI(55, 54)
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#define PT_A4 PT_LO(57, 56)
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#define PT_A5 PT_HI(57, 56)
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#define PT_A6 PT_LO(59, 58)
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#define PT_A7 PT_HI(59, 58)
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#define PT_A8 PT_LO(61, 60)
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#define PT_A9 PT_HI(61, 60)
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#define PT_A10 PT_LO(63, 62)
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#define PT_A11 PT_HI(63, 62)
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#define PT_A12 PT_LO(65, 64)
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#define PT_A13 PT_HI(65, 64)
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#define PT_A14 PT_LO(67, 66)
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#define PT_A15 PT_HI(67, 66)
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#define PT_B14 PT_LO(69, 68)
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#define PT_B15 PT_HI(69, 68)
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#define NR_PTREGS 70
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#define PT_DP PT_B14 /* Data Segment Pointer (B14) */
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#define PT_SP PT_B15 /* Stack Pointer (B15) */
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#ifndef __ASSEMBLY__
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#ifdef _BIG_ENDIAN
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#define REG_PAIR(odd, even) unsigned long odd; unsigned long even
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#else
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#define REG_PAIR(odd, even) unsigned long even; unsigned long odd
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#endif
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/*
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* this struct defines the way the registers are stored on the
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* stack during a system call. fields defined with REG_PAIR
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* are saved and restored using double-word memory operations
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* which means the word ordering of the pair depends on endianess.
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*/
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struct pt_regs {
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REG_PAIR(tsr, orig_a4);
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REG_PAIR(rilc, ilc);
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REG_PAIR(pc, csr);
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REG_PAIR(b17, b16);
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REG_PAIR(b19, b18);
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REG_PAIR(b21, b20);
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REG_PAIR(b23, b22);
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REG_PAIR(b25, b24);
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REG_PAIR(b27, b26);
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REG_PAIR(b29, b28);
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REG_PAIR(b31, b30);
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REG_PAIR(b1, b0);
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REG_PAIR(b3, b2);
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REG_PAIR(b5, b4);
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REG_PAIR(b7, b6);
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REG_PAIR(b9, b8);
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REG_PAIR(b11, b10);
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REG_PAIR(b13, b12);
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REG_PAIR(a17, a16);
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REG_PAIR(a19, a18);
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REG_PAIR(a21, a20);
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REG_PAIR(a23, a22);
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REG_PAIR(a25, a24);
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REG_PAIR(a27, a26);
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REG_PAIR(a29, a28);
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REG_PAIR(a31, a30);
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REG_PAIR(a1, a0);
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REG_PAIR(a3, a2);
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REG_PAIR(a5, a4);
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REG_PAIR(a7, a6);
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REG_PAIR(a9, a8);
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REG_PAIR(a11, a10);
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REG_PAIR(a13, a12);
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REG_PAIR(a15, a14);
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REG_PAIR(sp, dp);
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};
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#ifdef __KERNEL__
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#include <linux/linkage.h>
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#define user_mode(regs) ((((regs)->tsr) & 0x40) != 0)
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#define instruction_pointer(regs) ((regs)->pc)
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#define profile_pc(regs) instruction_pointer(regs)
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#define user_stack_pointer(regs) ((regs)->sp)
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extern void show_regs(struct pt_regs *);
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extern asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs);
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extern asmlinkage void syscall_trace_exit(struct pt_regs *regs);
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#endif /* __KERNEL__ */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_C6X_PTRACE_H */
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187
arch/c6x/kernel/ptrace.c
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187
arch/c6x/kernel/ptrace.c
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/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* Updated for 2.6.34: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/regset.h>
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#include <linux/elf.h>
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#include <asm/cacheflush.h>
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#define PT_REG_SIZE (sizeof(struct pt_regs))
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/*
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* Called by kernel/ptrace.c when detaching.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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/* nothing to do */
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}
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/*
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* Get a register number from live pt_regs for the specified task.
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*/
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static inline long get_reg(struct task_struct *task, int regno)
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{
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long *addr = (long *)task_pt_regs(task);
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if (regno == PT_TSR || regno == PT_CSR)
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return 0;
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return addr[regno];
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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static inline int put_reg(struct task_struct *task,
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int regno,
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unsigned long data)
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{
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unsigned long *addr = (unsigned long *)task_pt_regs(task);
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if (regno != PT_TSR && regno != PT_CSR)
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addr[regno] = data;
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return 0;
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}
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/* regset get/set implementations */
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static int gpr_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct pt_regs *regs = task_pt_regs(target);
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs,
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0, sizeof(*regs));
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}
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static int gpr_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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struct pt_regs *regs = task_pt_regs(target);
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/* Don't copyin TSR or CSR */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s,
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0, PT_TSR * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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PT_TSR * sizeof(long),
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(PT_TSR + 1) * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s,
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(PT_TSR + 1) * sizeof(long),
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PT_CSR * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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PT_CSR * sizeof(long),
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(PT_CSR + 1) * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s,
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(PT_CSR + 1) * sizeof(long), -1);
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return ret;
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}
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enum c6x_regset {
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REGSET_GPR,
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};
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static const struct user_regset c6x_regsets[] = {
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[REGSET_GPR] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(u32),
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.align = sizeof(u32),
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.get = gpr_get,
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.set = gpr_set
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},
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};
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static const struct user_regset_view user_c6x_native_view = {
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.name = "tic6x",
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.e_machine = EM_TI_C6000,
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.regsets = c6x_regsets,
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.n = ARRAY_SIZE(c6x_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_c6x_native_view;
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}
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/*
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* Perform ptrace request
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*/
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long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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{
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int ret = 0;
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switch (request) {
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/*
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* write the word at location addr.
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*/
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case PTRACE_POKETEXT:
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ret = generic_ptrace_pokedata(child, addr, data);
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if (ret == 0 && request == PTRACE_POKETEXT)
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flush_icache_range(addr, addr + 4);
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break;
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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/*
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* handle tracing of system call entry
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* - return the revised system call number or ULONG_MAX to cause ENOSYS
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*/
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asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
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{
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if (tracehook_report_syscall_entry(regs))
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/* tracing decided this syscall should not happen, so
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* We'll return a bogus call number to get an ENOSYS
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* error, but leave the original number in
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* regs->orig_a4
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*/
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return ULONG_MAX;
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return regs->b0;
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}
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/*
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* handle tracing of system call exit
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*/
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asmlinkage void syscall_trace_exit(struct pt_regs *regs)
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{
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tracehook_report_syscall_exit(regs, 0);
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}
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