352c1d95e3
Historically, pt_regs have had orig_r8, an overloaded container for (1) backup copy of r8 (syscall number Trap Exceptions) (2) additional system state: (syscall/Exception/Interrupt) There is no point in keeping (1) since syscall number is never clobbered in-place, in pt_regs, unlike r0 which duals as first syscall arg as well as syscall return value and in case of syscall restart, the orig arg0 needs restoring (from orig_r0) after having been updated in-place with syscall ret value. This further paves way to convert (2) to contain ECR itself (rather than current madeup values) Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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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* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
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*/
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#ifndef _UAPI__ASM_ARC_PTRACE_H
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#define _UAPI__ASM_ARC_PTRACE_H
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#ifndef __ASSEMBLY__
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/*
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* Userspace ABI: Register state needed by
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* -ptrace (gdbserver)
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* -sigcontext (SA_SIGNINFO signal frame)
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*
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* This is to decouple pt_regs from user-space ABI, to be able to change it
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* w/o affecting the ABI.
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*
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* The intermediate pad,pad2 are relics of initial layout based on pt_regs
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* for optimizations when copying pt_regs to/from user_regs_struct.
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* We no longer need them, but can't be changed as they are part of ABI now.
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*
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* Also, sigcontext only care about the scratch regs as that is what we really
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* save/restore for signal handling. However gdb also uses the same struct
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* hence callee regs need to be in there too.
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*/
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struct user_regs_struct {
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long pad;
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struct {
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long bta, lp_start, lp_end, lp_count;
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long status32, ret, blink, fp, gp;
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long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
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long sp;
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} scratch;
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long pad2;
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struct {
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long r25, r24, r23, r22, r21, r20;
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long r19, r18, r17, r16, r15, r14, r13;
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} callee;
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long efa; /* break pt addr, for break points in delay slots */
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long stop_pc; /* give dbg stop_pc after ensuring brkpt trap */
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};
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#endif /* !__ASSEMBLY__ */
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#endif /* _UAPI__ASM_ARC_PTRACE_H */
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