The save_ptregs() function has not been tested or even built. I will need
help to complete this.
This appeared to require a Makefile change in order to compile kernel/entry.S.
The problem was that it was complaining about having an "invalid instruction
for this architecture; needs 68000 or higher". Choosing a processor didn't
seem to help, but adding the processor to KBUILD_AFLAGS in appropriate places
resolved the problem. Has bit rot set in to the m68k tree?
Signed-off-by: David VomLehn <dvomlehn@xxxxxxxxx>
---
arch/m68k/Makefile | 2 +
arch/m68k/include/asm/ptrace.h | 74 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 76 insertions(+), 0 deletions(-)
diff --git a/arch/m68k/Makefile b/arch/m68k/Makefile
index 570d85c..bab0202 100644
--- a/arch/m68k/Makefile
+++ b/arch/m68k/Makefile
@@ -41,10 +41,12 @@ ifndef CONFIG_M68030
ifndef CONFIG_M68060
KBUILD_CFLAGS += -m68040
+KBUILD_AFLAGS += -m68040
endif
ifndef CONFIG_M68040
KBUILD_CFLAGS += -m68060
+KBUILD_AFLAGS += -m68060
endif
endif
diff --git a/arch/m68k/include/asm/ptrace.h b/arch/m68k/include/asm/ptrace.h
index ee4011c..2786ea4 100644
--- a/arch/m68k/include/asm/ptrace.h
+++ b/arch/m68k/include/asm/ptrace.h
@@ -85,6 +85,80 @@ struct switch_stack {
#define profile_pc(regs) instruction_pointer(regs)
extern void show_regs(struct pt_regs *);
+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+
+#include <linux/ptreg.h>
+
+#define PTREG_SAVE(r, name) "movel %" #r ", %[" #name "]\n"
+#define PTREG_SAVE_D(i) _PTREG_SAVE_I(d, d, i)
+#define PTREG_SAVE_A(i) _PTREG_SAVE_I(a, a, i)
+
+#define PTREG_OUT_D(regs, i) _PTREG_OUT_I(regs, d, d, i)
+#define PTREG_OUT_A(regs, i) _PTREG_OUT_I(regs, a, a, i)
+
+#define arch_has_save_ptregs 1
+
+/**
+ * save_ptregs - save processor registers for backtracing
+ * @regs: Pointer to &struct pt_regs structure in which to save the
+ * registers
+ *
+ * Returns a constant pointer to @regs.
+ *
+ * This function must be called first in a function. There must be no
+ * auto variables defined that are initialized before calling this function.
+ */
+static __always_inline
+const struct pt_regs *save_ptregs(struct pt_regs *regs)
+{
+ __asm__ __volatile__ (
+ PTREG_SAVE_D(1)
+ PTREG_SAVE_D(2)
+ PTREG_SAVE_D(3)
+ PTREG_SAVE_D(4)
+ PTREG_SAVE_D(5)
+ PTREG_SAVE_A(0)
+ PTREG_SAVE_A(1)
+ PTREG_SAVE_A(2)
+ PTREG_SAVE_D(0)
+ PTREG_SAVE(orig_d0, orig_d0)
+ PTREG_SAVE(stkadj, stkadj)
+#if 0
+ PTREG_SAVE(format, format)
+ PTREG_SAVE(vector, vector)
+#endif
+ PTREG_SAVE(sr, sr)
+ "1:\n"
+ "lea 1b, %a0"
+ PTREG_SAVE(a0, pc)
+ :
+ PTREG_OUT_D(regs, 0),
+ PTREG_OUT_D(regs, 1),
+ PTREG_OUT_D(regs, 2),
+ PTREG_OUT_D(regs, 3),
+ PTREG_OUT_D(regs, 4),
+ PTREG_OUT_D(regs, 5),
+ PTREG_OUT_A(regs, 0),
+ PTREG_OUT_A(regs, 1),
+ PTREG_OUT_A(regs, 2),
+ PTREG_OUT(regs, orig_d0, orig_d0),
+ PTREG_OUT(regs, stkadj, stkadj),
+#if 0
+/* Are these registers that must be saved? */
+ PTREG_OUT(regs, format, format),
+ PTREG_OUT(regs, vector, vector),
+#endif
+ PTREG_OUT(regs, sr, sr),
+ PTREG_OUT(regs, pc, pc)
+ :
+ :
+ "a0"
+ );
+
+ return regs;
+}
+
/*
* These are defined as per linux/ptrace.h.
*/
--
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