OpenRISC: PTrace
This patch implements minimal PTrace support. The pt_regs structure is
not exported to userspace for OpenRISC; rather, the GETREGSET mechanism
is intended to be used and the registers, as such, exported in the core
dump format which is ABI stable. This is in line with what is intended
for new architectures as of 2.6.34 and has the advantage of permitting
the layout of the registers on the kernel stack (as per pt_regs) to be
freely modified.
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/openrisc/include/asm/ptrace.h b/arch/openrisc/include/asm/ptrace.h
new file mode 100644
index 0000000..054537c
--- /dev/null
+++ b/arch/openrisc/include/asm/ptrace.h
@@ -0,0 +1,131 @@
+/*
+ * OpenRISC Linux
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * OpenRISC implementation:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ * et al.
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __ASM_OPENRISC_PTRACE_H
+#define __ASM_OPENRISC_PTRACE_H
+
+#include <asm/spr_defs.h>
+
+#ifndef __ASSEMBLY__
+/*
+ * This is the layout of the regset returned by the GETREGSET ptrace call
+ */
+struct user_regs_struct {
+ /* GPR R0-R31... */
+ unsigned long gpr[32];
+ unsigned long pc;
+ unsigned long sr;
+ unsigned long pad1;
+ unsigned long pad2;
+};
+#endif
+
+#ifdef __KERNEL__
+
+/*
+ * Make kernel PTrace/register structures opaque to userspace... userspace can
+ * access thread state via the regset mechanism. This allows us a bit of
+ * flexibility in how we order the registers on the stack, permitting some
+ * optimizations like packing call-clobbered registers together so that
+ * they share a cacheline (not done yet, though... future optimization).
+ */
+
+#ifndef __ASSEMBLY__
+/*
+ * This struct describes how the registers are laid out on the kernel stack
+ * during a syscall or other kernel entry.
+ *
+ * This structure should always be cacheline aligned on the stack.
+ * FIXME: I don't think that's the case right now. The alignment is
+ * taken care of elsewhere... head.S, process.c, etc.
+ */
+
+struct pt_regs {
+ union {
+ struct {
+ /* Named registers */
+ long sr; /* Stored in place of r0 */
+ long sp; /* r1 */
+ };
+ struct {
+ /* Old style */
+ long offset[2];
+ long gprs[30];
+ };
+ struct {
+ /* New style */
+ long gpr[32];
+ };
+ };
+ long pc;
+ long orig_gpr11; /* For restarting system calls */
+ long syscallno; /* Syscall number (used by strace) */
+ long dummy; /* Cheap alignment fix */
+};
+#endif /* __ASSEMBLY__ */
+
+/* TODO: Rename this to REDZONE because that's what it is */
+#define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */
+
+#define instruction_pointer(regs) ((regs)->pc)
+#define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0)
+#define user_stack_pointer(regs) ((unsigned long)(regs)->sp)
+#define profile_pc(regs) instruction_pointer(regs)
+
+/*
+ * Offsets used by 'ptrace' system call interface.
+ */
+#define PT_SR 0
+#define PT_SP 4
+#define PT_GPR2 8
+#define PT_GPR3 12
+#define PT_GPR4 16
+#define PT_GPR5 20
+#define PT_GPR6 24
+#define PT_GPR7 28
+#define PT_GPR8 32
+#define PT_GPR9 36
+#define PT_GPR10 40
+#define PT_GPR11 44
+#define PT_GPR12 48
+#define PT_GPR13 52
+#define PT_GPR14 56
+#define PT_GPR15 60
+#define PT_GPR16 64
+#define PT_GPR17 68
+#define PT_GPR18 72
+#define PT_GPR19 76
+#define PT_GPR20 80
+#define PT_GPR21 84
+#define PT_GPR22 88
+#define PT_GPR23 92
+#define PT_GPR24 96
+#define PT_GPR25 100
+#define PT_GPR26 104
+#define PT_GPR27 108
+#define PT_GPR28 112
+#define PT_GPR29 116
+#define PT_GPR30 120
+#define PT_GPR31 124
+#define PT_PC 128
+#define PT_ORIG_GPR11 132
+#define PT_SYSCALLNO 136
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_OPENRISC_PTRACE_H */