254458ab34
I fixed this in 1997, but the fix was over-engineered and fragile and was broken in 2003 if not before. i386 parameters were copied to 8 other arches verbatim, mostly after they stopped working on i386, and mostly without the large comment saying how the values were chosen on i386. powerpc has a non-verbatim copy which just changes the uncritical parameter and seems to add a sign extension bug to it. Just treat negative offsets as offsets if they are no more negative than -db_offset_max (default -64K), and remove all the broken parameters. -64K is not very negative, but it is enough for frame and stack pointer offsets since kernel stacks are small. The over-engineering was mainly to go more negative than -64K for the negative offset format, without affecting printing for more than a single address. Addresses in the top 64K of a (full 32-bit or 64-bit) address space are now printed less well, but there aren't many interesting ones. For arches that have many interesting ones very near the top (e.g., 68k has interrupt vectors there), there would be no good limit for the negative offset format and -64K is a good as anything.
124 lines
5.3 KiB
C
124 lines
5.3 KiB
C
/*-
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* Copyright (c) 2014 Andrew Turner
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* Copyright (c) 2014-2015 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Semihalf under
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* sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_DB_MACHDEP_H_
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#define _MACHINE_DB_MACHDEP_H_
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#include <machine/armreg.h>
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#include <machine/frame.h>
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#include <machine/trap.h>
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#define T_BREAKPOINT (EXCP_BRK)
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#define T_WATCHPOINT (EXCP_WATCHPT_EL1)
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typedef vm_offset_t db_addr_t;
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typedef long db_expr_t;
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#define PC_REGS() ((db_addr_t)kdb_thrctx->pcb_pc)
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#define BKPT_INST (0xd4200000)
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#define BKPT_SIZE (4)
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#define BKPT_SET(inst) (BKPT_INST)
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#define BKPT_SKIP do { \
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kdb_frame->tf_elr += BKPT_SIZE; \
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} while (0)
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#define db_clear_single_step kdb_cpu_clear_singlestep
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#define db_set_single_step kdb_cpu_set_singlestep
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#define IS_BREAKPOINT_TRAP(type, code) (type == T_BREAKPOINT)
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#define IS_WATCHPOINT_TRAP(type, code) (type == T_WATCHPOINT)
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#define inst_trap_return(ins) (0)
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/* ret */
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#define inst_return(ins) (((ins) & 0xfffffc1fu) == 0xd65f0000)
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#define inst_call(ins) (((ins) & 0xfc000000u) == 0x94000000u || /* BL */ \
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((ins) & 0xfffffc1fu) == 0xd63f0000u) /* BLR */
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#define inst_load(ins) ({ \
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uint32_t tmp_instr = db_get_value(PC_REGS(), sizeof(uint32_t), FALSE); \
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is_load_instr(tmp_instr); \
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})
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#define inst_store(ins) ({ \
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uint32_t tmp_instr = db_get_value(PC_REGS(), sizeof(uint32_t), FALSE); \
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is_store_instr(tmp_instr); \
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})
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#define is_load_instr(ins) ((((ins) & 0x3b000000u) == 0x18000000u) || /* literal */ \
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(((ins) & 0x3f400000u) == 0x08400000u) || /* exclusive */ \
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(((ins) & 0x3bc00000u) == 0x28400000u) || /* no-allocate pair */ \
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((((ins) & 0x3b200c00u) == 0x38000400u) && \
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(((ins) & 0x3be00c00u) != 0x38000400u) && \
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(((ins) & 0xffe00c00u) != 0x3c800400u)) || /* immediate post-indexed */ \
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((((ins) & 0x3b200c00u) == 0x38000c00u) && \
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(((ins) & 0x3be00c00u) != 0x38000c00u) && \
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(((ins) & 0xffe00c00u) != 0x3c800c00u)) || /* immediate pre-indexed */ \
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((((ins) & 0x3b200c00u) == 0x38200800u) && \
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(((ins) & 0x3be00c00u) != 0x38200800u) && \
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(((ins) & 0xffe00c00u) != 0x3ca00c80u)) || /* register offset */ \
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((((ins) & 0x3b200c00u) == 0x38000800u) && \
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(((ins) & 0x3be00c00u) != 0x38000800u)) || /* unprivileged */ \
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((((ins) & 0x3b200c00u) == 0x38000000u) && \
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(((ins) & 0x3be00c00u) != 0x38000000u) && \
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(((ins) & 0xffe00c00u) != 0x3c800000u)) || /* unscaled immediate */ \
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((((ins) & 0x3b000000u) == 0x39000000u) && \
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(((ins) & 0x3bc00000u) != 0x39000000u) && \
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(((ins) & 0xffc00000u) != 0x3d800000u)) && /* unsigned immediate */ \
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(((ins) & 0x3bc00000u) == 0x28400000u) || /* pair (offset) */ \
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(((ins) & 0x3bc00000u) == 0x28c00000u) || /* pair (post-indexed) */ \
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(((ins) & 0x3bc00000u) == 0x29800000u)) /* pair (pre-indexed) */
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#define is_store_instr(ins) ((((ins) & 0x3f400000u) == 0x08000000u) || /* exclusive */ \
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(((ins) & 0x3bc00000u) == 0x28000000u) || /* no-allocate pair */ \
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((((ins) & 0x3be00c00u) == 0x38000400u) || \
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(((ins) & 0xffe00c00u) == 0x3c800400u)) || /* immediate post-indexed */ \
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((((ins) & 0x3be00c00u) == 0x38000c00u) || \
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(((ins) & 0xffe00c00u) == 0x3c800c00u)) || /* immediate pre-indexed */ \
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((((ins) & 0x3be00c00u) == 0x38200800u) || \
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(((ins) & 0xffe00c00u) == 0x3ca00800u)) || /* register offset */ \
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(((ins) & 0x3be00c00u) == 0x38000800u) || /* unprivileged */ \
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((((ins) & 0x3be00c00u) == 0x38000000u) || \
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(((ins) & 0xffe00c00u) == 0x3c800000u)) || /* unscaled immediate */ \
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((((ins) & 0x3bc00000u) == 0x39000000u) || \
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(((ins) & 0xffc00000u) == 0x3d800000u)) || /* unsigned immediate */ \
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(((ins) & 0x3bc00000u) == 0x28000000u) || /* pair (offset) */ \
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(((ins) & 0x3bc00000u) == 0x28800000u) || /* pair (post-indexed) */ \
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(((ins) & 0x3bc00000u) == 0x29800000u)) /* pair (pre-indexed) */
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#define next_instr_address(pc, bd) ((bd) ? (pc) : ((pc) + 4))
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#define DB_ELFSIZE 64
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#endif /* !_MACHINE_DB_MACHDEP_H_ */
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