350 lines
9.0 KiB
C
350 lines
9.0 KiB
C
/* Copyright (C) 2009-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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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 as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "gdbsupport/common-defs.h"
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#include "nat/gdb_ptrace.h"
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#include "mips-linux-watch.h"
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/* Assuming usable watch registers REGS, return the irw_mask of
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register N. */
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uint32_t
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mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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return regs->mips32.watch_masks[n] & IRW_MASK;
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case pt_watch_style_mips64:
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return regs->mips64.watch_masks[n] & IRW_MASK;
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Assuming usable watch registers REGS, return the reg_mask of
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register N. */
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static uint32_t
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get_reg_mask (struct pt_watch_regs *regs, int n)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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return regs->mips32.watch_masks[n] & ~IRW_MASK;
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case pt_watch_style_mips64:
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return regs->mips64.watch_masks[n] & ~IRW_MASK;
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Assuming usable watch registers REGS, return the num_valid. */
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uint32_t
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mips_linux_watch_get_num_valid (struct pt_watch_regs *regs)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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return regs->mips32.num_valid;
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case pt_watch_style_mips64:
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return regs->mips64.num_valid;
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Assuming usable watch registers REGS, return the watchlo of
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register N. */
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CORE_ADDR
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mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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return regs->mips32.watchlo[n];
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case pt_watch_style_mips64:
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return regs->mips64.watchlo[n];
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Assuming usable watch registers REGS, set watchlo of register N to
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VALUE. */
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void
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mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n,
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CORE_ADDR value)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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/* The cast will never throw away bits as 64 bit addresses can
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never be used on a 32 bit kernel. */
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regs->mips32.watchlo[n] = (uint32_t) value;
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break;
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case pt_watch_style_mips64:
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regs->mips64.watchlo[n] = value;
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break;
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Assuming usable watch registers REGS, return the watchhi of
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register N. */
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uint32_t
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mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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return regs->mips32.watchhi[n];
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case pt_watch_style_mips64:
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return regs->mips64.watchhi[n];
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Assuming usable watch registers REGS, set watchhi of register N to
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VALUE. */
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void
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mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n,
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uint16_t value)
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{
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switch (regs->style)
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{
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case pt_watch_style_mips32:
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regs->mips32.watchhi[n] = value;
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break;
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case pt_watch_style_mips64:
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regs->mips64.watchhi[n] = value;
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break;
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default:
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internal_error (__FILE__, __LINE__,
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_("Unrecognized watch register style"));
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}
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}
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/* Read the watch registers of process LWPID and store it in
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WATCH_READBACK. Save true to *WATCH_READBACK_VALID if watch
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registers are valid. Return 1 if watch registers are usable.
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Cached information is used unless FORCE is true. */
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int
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mips_linux_read_watch_registers (long lwpid,
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struct pt_watch_regs *watch_readback,
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int *watch_readback_valid, int force)
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{
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if (force || *watch_readback_valid == 0)
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{
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if (ptrace (PTRACE_GET_WATCH_REGS, lwpid, watch_readback, NULL) == -1)
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{
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*watch_readback_valid = -1;
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return 0;
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}
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switch (watch_readback->style)
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{
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case pt_watch_style_mips32:
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if (watch_readback->mips32.num_valid == 0)
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{
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*watch_readback_valid = -1;
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return 0;
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}
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break;
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case pt_watch_style_mips64:
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if (watch_readback->mips64.num_valid == 0)
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{
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*watch_readback_valid = -1;
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return 0;
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}
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break;
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default:
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*watch_readback_valid = -1;
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return 0;
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}
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/* Watch registers appear to be usable. */
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*watch_readback_valid = 1;
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}
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return (*watch_readback_valid == 1) ? 1 : 0;
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}
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/* Convert GDB's TYPE to an IRW mask. */
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uint32_t
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mips_linux_watch_type_to_irw (enum target_hw_bp_type type)
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{
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switch (type)
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{
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case hw_write:
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return W_MASK;
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case hw_read:
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return R_MASK;
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case hw_access:
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return (W_MASK | R_MASK);
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default:
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return 0;
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}
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}
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/* Set any low order bits in MASK that are not set. */
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static CORE_ADDR
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fill_mask (CORE_ADDR mask)
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{
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CORE_ADDR f = 1;
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while (f && f < mask)
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{
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mask |= f;
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f <<= 1;
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}
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return mask;
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}
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/* Try to add a single watch to the specified registers REGS. The
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address of added watch is ADDR, the length is LEN, and the mask
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is IRW. Return 1 on success, 0 on failure. */
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int
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mips_linux_watch_try_one_watch (struct pt_watch_regs *regs,
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CORE_ADDR addr, int len, uint32_t irw)
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{
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CORE_ADDR base_addr, last_byte, break_addr, segment_len;
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CORE_ADDR mask_bits, t_low;
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uint16_t t_hi;
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int i, free_watches;
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struct pt_watch_regs regs_copy;
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if (len <= 0)
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return 0;
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last_byte = addr + len - 1;
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mask_bits = fill_mask (addr ^ last_byte) | IRW_MASK;
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base_addr = addr & ~mask_bits;
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/* Check to see if it is covered by current registers. */
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for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++)
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{
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t_low = mips_linux_watch_get_watchlo (regs, i);
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if (t_low != 0 && irw == ((uint32_t) t_low & irw))
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{
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t_hi = mips_linux_watch_get_watchhi (regs, i) | IRW_MASK;
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t_low &= ~(CORE_ADDR) t_hi;
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if (addr >= t_low && last_byte <= (t_low + t_hi))
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return 1;
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}
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}
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/* Try to find an empty register. */
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free_watches = 0;
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for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++)
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{
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t_low = mips_linux_watch_get_watchlo (regs, i);
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if (t_low == 0
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&& irw == (mips_linux_watch_get_irw_mask (regs, i) & irw))
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{
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if (mask_bits <= (get_reg_mask (regs, i) | IRW_MASK))
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{
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/* It fits, we'll take it. */
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mips_linux_watch_set_watchlo (regs, i, base_addr | irw);
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mips_linux_watch_set_watchhi (regs, i, mask_bits & ~IRW_MASK);
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return 1;
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}
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else
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{
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/* It doesn't fit, but has the proper IRW capabilities. */
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free_watches++;
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}
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}
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}
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if (free_watches > 1)
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{
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/* Try to split it across several registers. */
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regs_copy = *regs;
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for (i = 0; i < mips_linux_watch_get_num_valid (®s_copy); i++)
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{
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t_low = mips_linux_watch_get_watchlo (®s_copy, i);
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t_hi = get_reg_mask (®s_copy, i) | IRW_MASK;
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if (t_low == 0 && irw == (t_hi & irw))
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{
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t_low = addr & ~(CORE_ADDR) t_hi;
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break_addr = t_low + t_hi + 1;
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if (break_addr >= addr + len)
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segment_len = len;
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else
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segment_len = break_addr - addr;
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mask_bits = fill_mask (addr ^ (addr + segment_len - 1));
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mips_linux_watch_set_watchlo (®s_copy, i,
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(addr & ~mask_bits) | irw);
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mips_linux_watch_set_watchhi (®s_copy, i,
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mask_bits & ~IRW_MASK);
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if (break_addr >= addr + len)
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{
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*regs = regs_copy;
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return 1;
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}
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len = addr + len - break_addr;
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addr = break_addr;
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}
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}
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}
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/* It didn't fit anywhere, we failed. */
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return 0;
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}
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/* Fill in the watch registers REGS with the currently cached
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watches CURRENT_WATCHES. */
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void
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mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches,
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struct pt_watch_regs *regs)
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{
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struct mips_watchpoint *w;
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int i;
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/* Clear them out. */
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for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++)
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{
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mips_linux_watch_set_watchlo (regs, i, 0);
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mips_linux_watch_set_watchhi (regs, i, 0);
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}
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w = current_watches;
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while (w)
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{
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uint32_t irw = mips_linux_watch_type_to_irw (w->type);
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i = mips_linux_watch_try_one_watch (regs, w->addr, w->len, irw);
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/* They must all fit, because we previously calculated that they
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would. */
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gdb_assert (i);
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w = w->next;
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}
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}
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