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.
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*-
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* from: FreeBSD: src/sys/i386/include/db_machdep.h,v 1.16 1999/10/04
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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/frame.h>
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#include <machine/trap.h>
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#include <machine/armreg.h>
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#define T_BREAKPOINT (1)
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#define T_WATCHPOINT (2)
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typedef vm_offset_t db_addr_t;
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typedef int db_expr_t;
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#define PC_REGS() ((db_addr_t)kdb_thrctx->pcb_regs.sf_pc)
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#define BKPT_INST (KERNEL_BREAKPOINT)
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#define BKPT_SIZE (INSN_SIZE)
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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_pc += BKPT_SIZE; \
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} while (0)
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#if __ARM_ARCH >= 6
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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 db_pc_is_singlestep kdb_cpu_pc_is_singlestep
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#else
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#define SOFTWARE_SSTEP 1
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#endif
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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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/* ldmxx reg, {..., pc}
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01800000 stack mode
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000f0000 register
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0000ffff register list */
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/* mov pc, reg
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0000000f register */
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#define inst_return(ins) (((ins) & 0x0e108000) == 0x08108000 || \
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((ins) & 0x0ff0fff0) == 0x01a0f000 || \
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((ins) & 0x0ffffff0) == 0x012fff10) /* bx */
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/* bl ...
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00ffffff offset>>2 */
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#define inst_call(ins) (((ins) & 0x0f000000) == 0x0b000000)
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/* b ...
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00ffffff offset>>2 */
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/* ldr pc, [pc, reg, lsl #2]
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0000000f register */
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#define inst_branch(ins) (((ins) & 0x0f000000) == 0x0a000000 || \
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((ins) & 0x0fdffff0) == 0x079ff100 || \
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((ins) & 0x0cd0f000) == 0x0490f000 || \
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((ins) & 0x0ffffff0) == 0x012fff30 || /* blx */ \
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((ins) & 0x0de0f000) == 0x0080f000)
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#define inst_load(ins) (0)
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#define inst_store(ins) (0)
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#define next_instr_address(pc, bd) ((bd) ? (pc) : ((pc) + INSN_SIZE))
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#define DB_ELFSIZE 32
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int db_validate_address(vm_offset_t);
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u_int branch_taken (u_int insn, db_addr_t pc);
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#ifdef __ARMEB__
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#define BYTE_MSF (1)
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#endif
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#endif /* !_MACHINE_DB_MACHDEP_H_ */
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