From aaee205620e524600a02c486f5da47c731676c3e Mon Sep 17 00:00:00 2001 From: Yao Qi Date: Sat, 27 Jul 2013 07:49:05 +0000 Subject: [PATCH] gdb/ * Makefile.in (HFILES_NO_SRCDIR): Add common/mips-linux-watch.h. (mips-linux-watch.o): New rule. * common/mips-linux-watch.c: New. * common/mips-linux-watch.h: New. * config/mips/linux.mh (NATDEPFILES): Add mips-linux-watch.o * mips-linux-nat.c: Include mips-linux-watch.h. (W_BIT, R_BIT, I_BIT, W_MASK, R_MASK, I_MASK, IRW_MASK): Move to common/mips-linux-watch.h. (MAX_DEBUG_REGISTER): Likewise. (enum pt_watch_style): Likewise. (struct mips32_watch_regs): Likewise. (struct mips64_watch_regs): Likewise. (struct pt_watch_regs): Likewise. (struct mips_watchpoint): Likewise. (mips_linux_watch_get_irw_mask): Move to common/mips-linux-watch.c. (get_reg_mask, mips_linux_watch_get_num_valid): Likewise. (mips_linux_watch_get_watchlo): Likewise. (mips_linux_watch_set_watchlo): Likewise. (mips_linux_watch_get_watchhi): Likewise. (mips_linux_watch_set_watchhi): Likewise. (mips_linux_read_watch_registers): Likewise. (mips_linux_watch_type_to_irw): Likewise. (mips_linux_stopped_data_address, fill_mask): Likewise. (mips_linux_watch_try_one_watch): Likewise. (mips_linux_watch_populate_regs): Likewise. --- gdb/ChangeLog | 30 +++ gdb/Makefile.in | 6 +- gdb/common/mips-linux-watch.c | 349 +++++++++++++++++++++++++++++ gdb/common/mips-linux-watch.h | 126 +++++++++++ gdb/config/mips/linux.mh | 2 +- gdb/mips-linux-nat.c | 408 +--------------------------------- 6 files changed, 513 insertions(+), 408 deletions(-) create mode 100644 gdb/common/mips-linux-watch.c create mode 100644 gdb/common/mips-linux-watch.h diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2259dd4511..2d953fbd33 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,33 @@ +2013-07-27 Yao Qi + + * Makefile.in (HFILES_NO_SRCDIR): Add + common/mips-linux-watch.h. + (mips-linux-watch.o): New rule. + * common/mips-linux-watch.c: New. + * common/mips-linux-watch.h: New. + * config/mips/linux.mh (NATDEPFILES): Add mips-linux-watch.o + * mips-linux-nat.c: Include mips-linux-watch.h. + (W_BIT, R_BIT, I_BIT, W_MASK, R_MASK, I_MASK, IRW_MASK): Move + to common/mips-linux-watch.h. + (MAX_DEBUG_REGISTER): Likewise. + (enum pt_watch_style): Likewise. + (struct mips32_watch_regs): Likewise. + (struct mips64_watch_regs): Likewise. + (struct pt_watch_regs): Likewise. + (struct mips_watchpoint): Likewise. + (mips_linux_watch_get_irw_mask): Move to + common/mips-linux-watch.c. + (get_reg_mask, mips_linux_watch_get_num_valid): Likewise. + (mips_linux_watch_get_watchlo): Likewise. + (mips_linux_watch_set_watchlo): Likewise. + (mips_linux_watch_get_watchhi): Likewise. + (mips_linux_watch_set_watchhi): Likewise. + (mips_linux_read_watch_registers): Likewise. + (mips_linux_watch_type_to_irw): Likewise. + (mips_linux_stopped_data_address, fill_mask): Likewise. + (mips_linux_watch_try_one_watch): Likewise. + (mips_linux_watch_populate_regs): Likewise. + 2013-07-27 Yao Qi * mips-linux-nat.c (get_irw_mask): Rename to ... diff --git a/gdb/Makefile.in b/gdb/Makefile.in index 2d574d4228..8f4ee9e63a 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -787,7 +787,7 @@ LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c HFILES_NO_SRCDIR = \ common/gdb_signals.h common/gdb_thread_db.h common/gdb_vecs.h \ -common/i386-xstate.h common/linux-ptrace.h \ +common/i386-xstate.h common/linux-ptrace.h common/mips-linux-watch.h \ proc-utils.h aarch64-tdep.h arm-tdep.h ax-gdb.h ppcfbsd-tdep.h \ ppcnbsd-tdep.h cli-out.h gdb_expat.h breakpoint.h infcall.h obsd-tdep.h \ exec.h m32r-tdep.h osabi.h gdbcore.h solib-som.h amd64bsd-nat.h \ @@ -2026,6 +2026,10 @@ target-common.o: ${srcdir}/common/target-common.c $(COMPILE) $(srcdir)/common/target-common.c $(POSTCOMPILE) +mips-linux-watch.o: ${srcdir}/common/mips-linux-watch.c + $(COMPILE) $(srcdir)/common/mips-linux-watch.c + $(POSTCOMPILE) + # # gdb/tui/ dependencies # diff --git a/gdb/common/mips-linux-watch.c b/gdb/common/mips-linux-watch.c new file mode 100644 index 0000000000..875d6b7a4e --- /dev/null +++ b/gdb/common/mips-linux-watch.c @@ -0,0 +1,349 @@ +/* Copyright (C) 2009-2013 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 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, see . */ + +#include +#include "mips-linux-watch.h" +#include "gdb_assert.h" + +/* Assuming usable watch registers REGS, return the irw_mask of + register N. */ + +uint32_t +mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watch_masks[n] & IRW_MASK; + case pt_watch_style_mips64: + return regs->mips64.watch_masks[n] & IRW_MASK; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the reg_mask of + register N. */ + +static uint32_t +get_reg_mask (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watch_masks[n] & ~IRW_MASK; + case pt_watch_style_mips64: + return regs->mips64.watch_masks[n] & ~IRW_MASK; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the num_valid. */ + +uint32_t +mips_linux_watch_get_num_valid (struct pt_watch_regs *regs) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.num_valid; + case pt_watch_style_mips64: + return regs->mips64.num_valid; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the watchlo of + register N. */ + +CORE_ADDR +mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watchlo[n]; + case pt_watch_style_mips64: + return regs->mips64.watchlo[n]; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, set watchlo of register N to + VALUE. */ + +void +mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n, + CORE_ADDR value) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + /* The cast will never throw away bits as 64 bit addresses can + never be used on a 32 bit kernel. */ + regs->mips32.watchlo[n] = (uint32_t) value; + break; + case pt_watch_style_mips64: + regs->mips64.watchlo[n] = value; + break; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, return the watchhi of + register N. */ + +uint32_t +mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + return regs->mips32.watchhi[n]; + case pt_watch_style_mips64: + return regs->mips64.watchhi[n]; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Assuming usable watch registers REGS, set watchhi of register N to + VALUE. */ + +void +mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n, + uint16_t value) +{ + switch (regs->style) + { + case pt_watch_style_mips32: + regs->mips32.watchhi[n] = value; + break; + case pt_watch_style_mips64: + regs->mips64.watchhi[n] = value; + break; + default: + internal_error (__FILE__, __LINE__, + _("Unrecognized watch register style")); + } +} + +/* Read the watch registers of process LWPID and store it in + WATCH_READBACK. Save true to *WATCH_READBACK_VALID if watch + registers are valid. Return 1 if watch registers are usable. + Cached information is used unless FORCE is true. */ + +int +mips_linux_read_watch_registers (long lwpid, + struct pt_watch_regs *watch_readback, + int *watch_readback_valid, int force) +{ + if (force || *watch_readback_valid == 0) + { + if (ptrace (PTRACE_GET_WATCH_REGS, lwpid, watch_readback) == -1) + { + *watch_readback_valid = -1; + return 0; + } + switch (watch_readback->style) + { + case pt_watch_style_mips32: + if (watch_readback->mips32.num_valid == 0) + { + *watch_readback_valid = -1; + return 0; + } + break; + case pt_watch_style_mips64: + if (watch_readback->mips64.num_valid == 0) + { + *watch_readback_valid = -1; + return 0; + } + break; + default: + *watch_readback_valid = -1; + return 0; + } + /* Watch registers appear to be usable. */ + *watch_readback_valid = 1; + } + return (*watch_readback_valid == 1) ? 1 : 0; +} + +/* Convert GDB's TYPE to an IRW mask. */ + +uint32_t +mips_linux_watch_type_to_irw (int type) +{ + switch (type) + { + case hw_write: + return W_MASK; + case hw_read: + return R_MASK; + case hw_access: + return (W_MASK | R_MASK); + default: + return 0; + } +} + +/* Set any low order bits in MASK that are not set. */ + +static CORE_ADDR +fill_mask (CORE_ADDR mask) +{ + CORE_ADDR f = 1; + + while (f && f < mask) + { + mask |= f; + f <<= 1; + } + return mask; +} + +/* Try to add a single watch to the specified registers REGS. The + address of added watch is ADDR, the length is LEN, and the mask + is IRW. Return 1 on success, 0 on failure. */ + +int +mips_linux_watch_try_one_watch (struct pt_watch_regs *regs, + CORE_ADDR addr, int len, uint32_t irw) +{ + CORE_ADDR base_addr, last_byte, break_addr, segment_len; + CORE_ADDR mask_bits, t_low; + uint16_t t_hi; + int i, free_watches; + struct pt_watch_regs regs_copy; + + if (len <= 0) + return 0; + + last_byte = addr + len - 1; + mask_bits = fill_mask (addr ^ last_byte) | IRW_MASK; + base_addr = addr & ~mask_bits; + + /* Check to see if it is covered by current registers. */ + for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) + { + t_low = mips_linux_watch_get_watchlo (regs, i); + if (t_low != 0 && irw == ((uint32_t) t_low & irw)) + { + t_hi = mips_linux_watch_get_watchhi (regs, i) | IRW_MASK; + t_low &= ~(CORE_ADDR) t_hi; + if (addr >= t_low && last_byte <= (t_low + t_hi)) + return 1; + } + } + /* Try to find an empty register. */ + free_watches = 0; + for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) + { + t_low = mips_linux_watch_get_watchlo (regs, i); + if (t_low == 0 + && irw == (mips_linux_watch_get_irw_mask (regs, i) & irw)) + { + if (mask_bits <= (get_reg_mask (regs, i) | IRW_MASK)) + { + /* It fits, we'll take it. */ + mips_linux_watch_set_watchlo (regs, i, base_addr | irw); + mips_linux_watch_set_watchhi (regs, i, mask_bits & ~IRW_MASK); + return 1; + } + else + { + /* It doesn't fit, but has the proper IRW capabilities. */ + free_watches++; + } + } + } + if (free_watches > 1) + { + /* Try to split it across several registers. */ + regs_copy = *regs; + for (i = 0; i < mips_linux_watch_get_num_valid (®s_copy); i++) + { + t_low = mips_linux_watch_get_watchlo (®s_copy, i); + t_hi = get_reg_mask (®s_copy, i) | IRW_MASK; + if (t_low == 0 && irw == (t_hi & irw)) + { + t_low = addr & ~(CORE_ADDR) t_hi; + break_addr = t_low + t_hi + 1; + if (break_addr >= addr + len) + segment_len = len; + else + segment_len = break_addr - addr; + mask_bits = fill_mask (addr ^ (addr + segment_len - 1)); + mips_linux_watch_set_watchlo (®s_copy, i, + (addr & ~mask_bits) | irw); + mips_linux_watch_set_watchhi (®s_copy, i, + mask_bits & ~IRW_MASK); + if (break_addr >= addr + len) + { + *regs = regs_copy; + return 1; + } + len = addr + len - break_addr; + addr = break_addr; + } + } + } + /* It didn't fit anywhere, we failed. */ + return 0; +} + +/* Fill in the watch registers REGS with the currently cached + watches CURRENT_WATCHES. */ + +void +mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches, + struct pt_watch_regs *regs) +{ + struct mips_watchpoint *w; + int i; + + /* Clear them out. */ + for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) + { + mips_linux_watch_set_watchlo (regs, i, 0); + mips_linux_watch_set_watchhi (regs, i, 0); + } + + w = current_watches; + while (w) + { + uint32_t irw = mips_linux_watch_type_to_irw (w->type); + + i = mips_linux_watch_try_one_watch (regs, w->addr, w->len, irw); + /* They must all fit, because we previously calculated that they + would. */ + gdb_assert (i); + w = w->next; + } +} diff --git a/gdb/common/mips-linux-watch.h b/gdb/common/mips-linux-watch.h new file mode 100644 index 0000000000..aa89f19876 --- /dev/null +++ b/gdb/common/mips-linux-watch.h @@ -0,0 +1,126 @@ +/* Copyright (C) 2009-2013 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 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, see . */ + +#ifndef MIPS_LINUX_WATCH_H +#define MIPS_LINUX_WATCH_H 1 + +#ifdef GDBSERVER +#include "server.h" +#else +#include "defs.h" +#endif + +#include +#include + +#include "break-common.h" + +#define MAX_DEBUG_REGISTER 8 + +/* If macro PTRACE_GET_WATCH_REGS is not defined, kernel header doesn't + have hardware watchpoint-related structures. Define them below. */ + +#ifndef PTRACE_GET_WATCH_REGS +# define PTRACE_GET_WATCH_REGS 0xd0 +# define PTRACE_SET_WATCH_REGS 0xd1 + +enum pt_watch_style { + pt_watch_style_mips32, + pt_watch_style_mips64 +}; + +/* A value of zero in a watchlo indicates that it is available. */ + +struct mips32_watch_regs +{ + uint32_t watchlo[MAX_DEBUG_REGISTER]; + /* Lower 16 bits of watchhi. */ + uint16_t watchhi[MAX_DEBUG_REGISTER]; + /* Valid mask and I R W bits. + * bit 0 -- 1 if W bit is usable. + * bit 1 -- 1 if R bit is usable. + * bit 2 -- 1 if I bit is usable. + * bits 3 - 11 -- Valid watchhi mask bits. + */ + uint16_t watch_masks[MAX_DEBUG_REGISTER]; + /* The number of valid watch register pairs. */ + uint32_t num_valid; + /* There is confusion across gcc versions about structure alignment, + so we force 8 byte alignment for these structures so they match + the kernel even if it was build with a different gcc version. */ +} __attribute__ ((aligned (8))); + +struct mips64_watch_regs +{ + uint64_t watchlo[MAX_DEBUG_REGISTER]; + uint16_t watchhi[MAX_DEBUG_REGISTER]; + uint16_t watch_masks[MAX_DEBUG_REGISTER]; + uint32_t num_valid; +} __attribute__ ((aligned (8))); + +struct pt_watch_regs +{ + enum pt_watch_style style; + union + { + struct mips32_watch_regs mips32; + struct mips64_watch_regs mips64; + }; +}; + +#endif /* !PTRACE_GET_WATCH_REGS */ + +#define W_BIT 0 +#define R_BIT 1 +#define I_BIT 2 + +#define W_MASK (1 << W_BIT) +#define R_MASK (1 << R_BIT) +#define I_MASK (1 << I_BIT) + +#define IRW_MASK (I_MASK | R_MASK | W_MASK) + +/* We keep list of all watchpoints we should install and calculate the + watch register values each time the list changes. This allows for + easy sharing of watch registers for more than one watchpoint. */ + +struct mips_watchpoint +{ + CORE_ADDR addr; + int len; + int type; + struct mips_watchpoint *next; +}; + +uint32_t mips_linux_watch_get_num_valid (struct pt_watch_regs *regs); +uint32_t mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n); +CORE_ADDR mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n); +void mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n, + CORE_ADDR value); +uint32_t mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n); +void mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n, + uint16_t value); +int mips_linux_watch_try_one_watch (struct pt_watch_regs *regs, + CORE_ADDR addr, int len, uint32_t irw); +void mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches, + struct pt_watch_regs *regs); +uint32_t mips_linux_watch_type_to_irw (int type); + +int mips_linux_read_watch_registers (long lwpid, + struct pt_watch_regs *watch_readback, + int *watch_readback_valid, int force); +#endif diff --git a/gdb/config/mips/linux.mh b/gdb/config/mips/linux.mh index 2f8e5dd309..a4f23e3c9d 100644 --- a/gdb/config/mips/linux.mh +++ b/gdb/config/mips/linux.mh @@ -3,7 +3,7 @@ NAT_FILE= config/nm-linux.h NATDEPFILES= inf-ptrace.o fork-child.o mips-linux-nat.o \ linux-thread-db.o proc-service.o \ linux-nat.o linux-osdata.o linux-fork.o \ - linux-procfs.o linux-ptrace.o + linux-procfs.o linux-ptrace.o mips-linux-watch.o NAT_CDEPS = $(srcdir)/proc-service.list LOADLIBES = -ldl $(RDYNAMIC) diff --git a/gdb/mips-linux-nat.c b/gdb/mips-linux-nat.c index d792cb3dd8..9246741c71 100644 --- a/gdb/mips-linux-nat.c +++ b/gdb/mips-linux-nat.c @@ -36,6 +36,8 @@ #include #include +#include "mips-linux-watch.h" + #include "features/mips-linux.c" #include "features/mips-dsp-linux.c" #include "features/mips64-linux.c" @@ -461,71 +463,6 @@ mips_linux_read_description (struct target_ops *ops) return have_dsp ? tdesc_mips64_dsp_linux : tdesc_mips64_linux; } -#define MAX_DEBUG_REGISTER 8 - -/* If macro PTRACE_GET_WATCH_REGS is not defined, kernel header doesn't - have hardware watchpoint-related structures. Define them below. */ - -#ifndef PTRACE_GET_WATCH_REGS -# define PTRACE_GET_WATCH_REGS 0xd0 -# define PTRACE_SET_WATCH_REGS 0xd1 - -enum pt_watch_style { - pt_watch_style_mips32, - pt_watch_style_mips64 -}; - -/* A value of zero in a watchlo indicates that it is available. */ - -struct mips32_watch_regs -{ - uint32_t watchlo[MAX_DEBUG_REGISTER]; - /* Lower 16 bits of watchhi. */ - uint16_t watchhi[MAX_DEBUG_REGISTER]; - /* Valid mask and I R W bits. - * bit 0 -- 1 if W bit is usable. - * bit 1 -- 1 if R bit is usable. - * bit 2 -- 1 if I bit is usable. - * bits 3 - 11 -- Valid watchhi mask bits. - */ - uint16_t watch_masks[MAX_DEBUG_REGISTER]; - /* The number of valid watch register pairs. */ - uint32_t num_valid; - /* There is confusion across gcc versions about structure alignment, - so we force 8 byte alignment for these structures so they match - the kernel even if it was build with a different gcc version. */ -} __attribute__ ((aligned (8))); - -struct mips64_watch_regs -{ - uint64_t watchlo[MAX_DEBUG_REGISTER]; - uint16_t watchhi[MAX_DEBUG_REGISTER]; - uint16_t watch_masks[MAX_DEBUG_REGISTER]; - uint32_t num_valid; -} __attribute__ ((aligned (8))); - -struct pt_watch_regs -{ - enum pt_watch_style style; - union - { - struct mips32_watch_regs mips32; - struct mips64_watch_regs mips64; - }; -}; - -#endif /* !PTRACE_GET_WATCH_REGS */ - -#define W_BIT 0 -#define R_BIT 1 -#define I_BIT 2 - -#define W_MASK (1 << W_BIT) -#define R_MASK (1 << R_BIT) -#define I_MASK (1 << I_BIT) - -#define IRW_MASK (I_MASK | R_MASK | W_MASK) - /* -1 if the kernel and/or CPU do not support watch registers. 1 if watch_readback is valid and we can read style, num_valid and the masks. @@ -537,18 +474,6 @@ static int watch_readback_valid; static struct pt_watch_regs watch_readback; -/* We keep list of all watchpoints we should install and calculate the - watch register values each time the list changes. This allows for - easy sharing of watch registers for more than one watchpoint. */ - -struct mips_watchpoint -{ - CORE_ADDR addr; - int len; - int type; - struct mips_watchpoint *next; -}; - static struct mips_watchpoint *current_watches; /* The current set of watch register values for writing the @@ -556,139 +481,6 @@ static struct mips_watchpoint *current_watches; static struct pt_watch_regs watch_mirror; -/* Assuming usable watch registers REGS, return the irw_mask of - register N. */ - -static uint32_t -mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - return regs->mips32.watch_masks[n] & IRW_MASK; - case pt_watch_style_mips64: - return regs->mips64.watch_masks[n] & IRW_MASK; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - -/* Assuming usable watch registers REGS, return the reg_mask of - register N. */ - -static uint32_t -get_reg_mask (struct pt_watch_regs *regs, int n) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - return regs->mips32.watch_masks[n] & ~IRW_MASK; - case pt_watch_style_mips64: - return regs->mips64.watch_masks[n] & ~IRW_MASK; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - -/* Assuming usable watch registers REGS, return the num_valid. */ - -static uint32_t -mips_linux_watch_get_num_valid (struct pt_watch_regs *regs) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - return regs->mips32.num_valid; - case pt_watch_style_mips64: - return regs->mips64.num_valid; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - -/* Assuming usable watch registers REGS, return the watchlo of - register N. */ - -static CORE_ADDR -mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - return regs->mips32.watchlo[n]; - case pt_watch_style_mips64: - return regs->mips64.watchlo[n]; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - -/* Assuming usable watch registers REGS, set watchlo of register N to - VALUE. */ - -static void -mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n, - CORE_ADDR value) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - /* The cast will never throw away bits as 64 bit addresses can - never be used on a 32 bit kernel. */ - regs->mips32.watchlo[n] = (uint32_t) value; - break; - case pt_watch_style_mips64: - regs->mips64.watchlo[n] = value; - break; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - -/* Assuming usable watch registers REGS, return the watchhi of - register N. */ - -static uint32_t -mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - return regs->mips32.watchhi[n]; - case pt_watch_style_mips64: - return regs->mips64.watchhi[n]; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - -/* Assuming usable watch registers REGS, set watchhi of register N to - VALUE. */ - -static void -mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n, - uint16_t value) -{ - switch (regs->style) - { - case pt_watch_style_mips32: - regs->mips32.watchhi[n] = value; - break; - case pt_watch_style_mips64: - regs->mips64.watchhi[n] = value; - break; - default: - internal_error (__FILE__, __LINE__, - _("Unrecognized watch register style")); - } -} - static void mips_show_dr (const char *func, CORE_ADDR addr, int len, enum target_hw_bp_type type) @@ -716,67 +508,6 @@ mips_show_dr (const char *func, CORE_ADDR addr, i))); } -/* Read the watch registers of process LWPID and store it in - WATCH_READBACK. Save true to *WATCH_READBACK_VALID if watch - registers are valid. Return 1 if watch registers are usable. - Cached information is used unless FORCE is true. */ - -static int -mips_linux_read_watch_registers (long lwpid, - struct pt_watch_regs *watch_readback, - int *watch_readback_valid, int force) -{ - if (force || *watch_readback_valid == 0) - { - if (ptrace (PTRACE_GET_WATCH_REGS, lwpid, watch_readback) == -1) - { - *watch_readback_valid = -1; - return 0; - } - switch (watch_readback->style) - { - case pt_watch_style_mips32: - if (watch_readback->mips32.num_valid == 0) - { - *watch_readback_valid = -1; - return 0; - } - break; - case pt_watch_style_mips64: - if (watch_readback->mips64.num_valid == 0) - { - *watch_readback_valid = -1; - return 0; - } - break; - default: - *watch_readback_valid = -1; - return 0; - } - /* Watch registers appear to be usable. */ - *watch_readback_valid = 1; - } - return (*watch_readback_valid == 1) ? 1 : 0; -} - -/* Convert GDB's TYPE to an IRW mask. */ - -static uint32_t -mips_linux_watch_type_to_irw (int type) -{ - switch (type) - { - case hw_write: - return W_MASK; - case hw_read: - return R_MASK; - case hw_access: - return (W_MASK | R_MASK); - default: - return 0; - } -} - /* Target to_can_use_hw_breakpoint implementation. Return 1 if we can handle the specified watch type. */ @@ -853,111 +584,6 @@ mips_linux_stopped_data_address (struct target_ops *t, CORE_ADDR *paddr) return 0; } -/* Set any low order bits in MASK that are not set. */ - -static CORE_ADDR -fill_mask (CORE_ADDR mask) -{ - CORE_ADDR f = 1; - - while (f && f < mask) - { - mask |= f; - f <<= 1; - } - return mask; -} - -/* Try to add a single watch to the specified registers REGS. The - address of added watch is ADDR, the length is LEN, and the mask - is IRW. Return 1 on success, 0 on failure. */ - -static int -mips_linux_watch_try_one_watch (struct pt_watch_regs *regs, - CORE_ADDR addr, int len, uint32_t irw) -{ - CORE_ADDR base_addr, last_byte, break_addr, segment_len; - CORE_ADDR mask_bits, t_low; - uint16_t t_hi; - int i, free_watches; - struct pt_watch_regs regs_copy; - - if (len <= 0) - return 0; - - last_byte = addr + len - 1; - mask_bits = fill_mask (addr ^ last_byte) | IRW_MASK; - base_addr = addr & ~mask_bits; - - /* Check to see if it is covered by current registers. */ - for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) - { - t_low = mips_linux_watch_get_watchlo (regs, i); - if (t_low != 0 && irw == ((uint32_t) t_low & irw)) - { - t_hi = mips_linux_watch_get_watchhi (regs, i) | IRW_MASK; - t_low &= ~(CORE_ADDR) t_hi; - if (addr >= t_low && last_byte <= (t_low + t_hi)) - return 1; - } - } - /* Try to find an empty register. */ - free_watches = 0; - for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) - { - t_low = mips_linux_watch_get_watchlo (regs, i); - if (t_low == 0 - && irw == (mips_linux_watch_get_irw_mask (regs, i) & irw)) - { - if (mask_bits <= (get_reg_mask (regs, i) | IRW_MASK)) - { - /* It fits, we'll take it. */ - mips_linux_watch_set_watchlo (regs, i, base_addr | irw); - mips_linux_watch_set_watchhi (regs, i, mask_bits & ~IRW_MASK); - return 1; - } - else - { - /* It doesn't fit, but has the proper IRW capabilities. */ - free_watches++; - } - } - } - if (free_watches > 1) - { - /* Try to split it across several registers. */ - regs_copy = *regs; - for (i = 0; i < mips_linux_watch_get_num_valid (®s_copy); i++) - { - t_low = mips_linux_watch_get_watchlo (®s_copy, i); - t_hi = get_reg_mask (®s_copy, i) | IRW_MASK; - if (t_low == 0 && irw == (t_hi & irw)) - { - t_low = addr & ~(CORE_ADDR) t_hi; - break_addr = t_low + t_hi + 1; - if (break_addr >= addr + len) - segment_len = len; - else - segment_len = break_addr - addr; - mask_bits = fill_mask (addr ^ (addr + segment_len - 1)); - mips_linux_watch_set_watchlo (®s_copy, i, - (addr & ~mask_bits) | irw); - mips_linux_watch_set_watchhi (®s_copy, i, - mask_bits & ~IRW_MASK); - if (break_addr >= addr + len) - { - *regs = regs_copy; - return 1; - } - len = addr + len - break_addr; - addr = break_addr; - } - } - } - /* It didn't fit anywhere, we failed. */ - return 0; -} - /* Target to_region_ok_for_hw_watchpoint implementation. Return 1 if the specified region can be covered by the watch registers. */ @@ -1014,36 +640,6 @@ mips_linux_new_thread (struct lwp_info *lp) perror_with_name (_("Couldn't write debug register")); } -/* Fill in the watch registers REGS with the currently cached - watches CURRENT_WATCHES. */ - -static void -mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches, - struct pt_watch_regs *regs) -{ - struct mips_watchpoint *w; - int i; - - /* Clear them out. */ - for (i = 0; i < mips_linux_watch_get_num_valid (regs); i++) - { - mips_linux_watch_set_watchlo (regs, i, 0); - mips_linux_watch_set_watchhi (regs, i, 0); - } - - w = current_watches; - while (w) - { - uint32_t irw = mips_linux_watch_type_to_irw (w->type); - - i = mips_linux_watch_try_one_watch (regs, w->addr, w->len, irw); - /* They must all fit, because we previously calculated that they - would. */ - gdb_assert (i); - w = w->next; - } -} - /* Target to_insert_watchpoint implementation. Try to insert a new watch. Return zero on success. */ -- 2.34.1