Prev: [PATCH 2/23] Make register values available to Alpha panic notifiers
Next: [PATCH 4/23] Make register values available to AV32 panic notifiers
From: David VomLehn on 12 Apr 2010 02:10
The save_ptregs() function has not been tested or even built. I will need
help to complete this.

Signed-off-by: David VomLehn <dvomlehn(a)cisco.com>
---
arch/m32r/include/asm/ptrace.h | 91 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 91 insertions(+), 0 deletions(-)

diff --git a/arch/m32r/include/asm/ptrace.h b/arch/m32r/include/asm/ptrace.h
index a0755b9..54f3239 100644
--- a/arch/m32r/include/asm/ptrace.h
+++ b/arch/m32r/include/asm/ptrace.h
@@ -143,6 +143,97 @@ extern void withdraw_debug_trap(struct pt_regs *regs);
#define task_pt_regs(task) \
((struct pt_regs *)(task_stack_page(task) + THREAD_SIZE) - 1)

+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#include "/home/vomlehn/git/kernel.org/ptreg.h"
+#define PTREG_SAVE(r, name) "movel " #r ", %[" #r "]\n"
+#define PTREG_SAVE_R(i) PTREG_SAVE_I(r, r, i)
+
+#define PTREG_OUT_R(regs, i) PTREG_OUT_I(regs, r, r, 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_R(4)
+ PTREG_SAVE_R(5)
+ PTREG_SAVE_R(6)
+ PTREG_SAVE(pt_regs, pt_regs)
+ PTREG_SAVE_R(0)
+ PTREG_SAVE_R(1)
+ PTREG_SAVE_R(2)
+ PTREG_SAVE_R(3)
+ PTREG_SAVE_R(7)
+ PTREG_SAVE_R(8)
+ PTREG_SAVE_R(9)
+ PTREG_SAVE_R(10)
+ PTREG_SAVE_R(11)
+ PTREG_SAVE_R(12)
+ PTREG_SAVE(syscall_nr, syscall_nr)
+ PTREG_SAVE(acc0h, acc0h)
+ PTREG_SAVE(acc0l, acc0l)
+ PTREG_SAVE(acc1h, acc1h)
+ PTREG_SAVE(acc1l, acc1l)
+ PTREG_SAVE(psw, psw)
+ PTREG_SAVE(bpc, bpc)
+ PTREG_SAVE(bbpsw, bbpsw)
+ PTREG_SAVE(bbpc, bbpc)
+ PTREG_SAVE(spu, spu)
+ PTREG_SAVE(fp, fp)
+ PTREG_SAVE(lr, lr)
+ PTREG_SAVE(spi, spi)
+ PTREG_SAVE(orig_r0, orig_r0)
+ "1:\n"
+ "seth r0, #high(1b)\n"
+ "or3 r0, r0, #low(1b)\n"
+ PTREG_SAVE(r0, bpc)
+ :
+ PTREG_OUT_R(regs, 4),
+ PTREG_OUT_R(regs, 5),
+ PTREG_OUT_R(regs, 6),
+ PTREG_OUT(regs, pt_regs, pt_regs),
+ PTREG_OUT_R(regs, 0),
+ PTREG_OUT_R(regs, 1),
+ PTREG_OUT_R(regs, 2),
+ PTREG_OUT_R(regs, 3),
+ PTREG_OUT_R(regs, 7),
+ PTREG_OUT_R(regs, 8),
+ PTREG_OUT_R(regs, 9),
+ PTREG_OUT_R(regs, 10),
+ PTREG_OUT_R(regs, 11),
+ PTREG_OUT_R(regs, 12),
+ PTREG_OUT(regs, syscall_nr, syscall_nr),
+ PTREG_OUT(regs, acc0h, acc0h),
+ PTREG_OUT(regs, acc0l, acc0l),
+ PTREG_OUT(regs, acc1h, acc1h),
+ PTREG_OUT(regs, acc1l, acc1l),
+ PTREG_OUT(regs, psw, psw),
+ PTREG_OUT(regs, bpc, bpc),
+ PTREG_OUT(regs, bbpsw, bbpsw),
+ PTREG_OUT(regs, bbpc, bbpc),
+ PTREG_OUT(regs, spu, spu),
+ PTREG_OUT(regs, fp, fp),
+ PTREG_OUT(regs, lr, lr),
+ PTREG_OUT(regs, spi, spi),
+ PTREG_OUT(regs, orig_r0, orig_r0)
+ :
+ "r0"
+ );
+
+ return regs;
+}
#endif /* __KERNEL */

#endif /* _ASM_M32R_PTRACE_H */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
 | 
Pages: 1
Prev: [PATCH 2/23] Make register values available to Alpha panic notifiers
Next: [PATCH 4/23] Make register values available to AV32 panic notifiers