linux-kernel - [PATCH 7/23] Make register values available to FRV panic notifiers

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Date:	Sun, 11 Apr 2010 23:03:58 -0700
From:	David VomLehn <dvomlehn@...co.com>
To:	to@...mlehn-lnx2.corp.sa.net,
	"linux_arch"@dvomlehn-lnx2.corp.sa.net,
	linux_arch@...mlehn-lnx2.corp.sa.net
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	maint_arch@...mlehn-lnx2.corp.sa.net
Subject: [PATCH 7/23] Make register values available to FRV panic notifiers

The save_ptregs() function has not been tested or even built. I will need
help to complete this.

Signed-off-by: David VomLehn <dvomlehn@...co.com>
---
 arch/frv/include/asm/ptrace.h |  124 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 124 insertions(+), 0 deletions(-)

diff --git a/arch/frv/include/asm/ptrace.h b/arch/frv/include/asm/ptrace.h
index 6bfad4c..7365c6a 100644
--- a/arch/frv/include/asm/ptrace.h
+++ b/arch/frv/include/asm/ptrace.h
@@ -85,6 +85,130 @@ extern void show_regs(struct pt_regs *);
 
 #define arch_has_single_step()	(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)	"std	" #r ", %[" # name "]\n"
+#define PTREG_SAVE_GR(i)		PTREG_SAVE_I(gr, gr, i)
+
+#define PTREG_OUT_GR(regs, i)	PTREG_OUT_I(regs, gr, 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(psr, psr)
+			PTREG_SAVE(isr, isr)
+			PTREG_SAVE(ccr, ccr)
+			PTREG_SAVE(cccr, cccr)
+			PTREG_SAVE(lr, lr)
+			PTREG_SAVE(lcr, lcr)
+			PTREG_SAVE(__status, __status)
+			PTREG_SAVE(syscallno, syscallno)
+			PTREG_SAVE(orig_gr8, orig_gr8)
+			PTREG_SAVE(gner0, gner0)
+			PTREG_SAVE(gner1, gner1)
+			PTREG_SAVE(iacc0, iacc0)
+			PTREG_SAVE(tbr, tbr)
+			PTREG_SAVE(sp, sp)
+			PTREG_SAVE(fp, fp)
+			PTREG_SAVE_GR(3)
+			PTREG_SAVE_GR(4)
+			PTREG_SAVE_GR(5)
+			PTREG_SAVE_GR(6)
+			PTREG_SAVE_GR(7)
+			PTREG_SAVE_GR(8)
+			PTREG_SAVE_GR(9)
+			PTREG_SAVE_GR(10)
+			PTREG_SAVE_GR(11)
+			PTREG_SAVE_GR(12)
+			PTREG_SAVE_GR(13)
+			PTREG_SAVE_GR(14)
+			PTREG_SAVE_GR(15)
+			PTREG_SAVE_GR(16)
+			PTREG_SAVE_GR(17)
+			PTREG_SAVE_GR(18)
+			PTREG_SAVE_GR(19)
+			PTREG_SAVE_GR(20)
+			PTREG_SAVE_GR(21)
+			PTREG_SAVE_GR(22)
+			PTREG_SAVE_GR(23)
+			PTREG_SAVE_GR(24)
+			PTREG_SAVE_GR(25)
+			PTREG_SAVE_GR(26)
+			PTREG_SAVE_GR(27)
+			PTREG_SAVE(next_frame, next_frame)
+			PTREG_SAVE_GR(29)
+			PTREG_SAVE_GR(30)
+			PTREG_SAVE_GR(31)
+		"1:\n"
+			"sethi.p	#1b, gr0\n"
+			"setlo		#1b, gr0\n"
+			PTREG_SAVE(gr0, pc)
+	:
+		PTREG_OUT(regs, psr, psr),
+		PTREG_OUT(regs, isr, isr),
+		PTREG_OUT(regs, ccr, ccr),
+		PTREG_OUT(regs, cccr, cccr),
+		PTREG_OUT(regs, lr, lr),
+		PTREG_OUT(regs, lcr, lcr),
+		PTREG_OUT(regs, pc, pc),
+		PTREG_OUT(regs, __status, __status),
+		PTREG_OUT(regs, syscallno, syscallno),
+		PTREG_OUT(regs, orig_gr8, orig_gr8),
+		PTREG_OUT(regs, gner0, gner0),
+		PTREG_OUT(regs, gner1, gner1),
+		PTREG_OUT(regs, iacc0, iacc0),
+		PTREG_OUT(regs, tbr, tbr),
+		PTREG_OUT(regs, sp, sp),
+		PTREG_OUT(regs, fp, fp),
+		PTREG_OUT_GR(regs, 3),
+		PTREG_OUT_GR(regs, 4),
+		PTREG_OUT_GR(regs, 5),
+		PTREG_OUT_GR(regs, 6),
+		PTREG_OUT_GR(regs, 7),
+		PTREG_OUT_GR(regs, 8),
+		PTREG_OUT_GR(regs, 9),
+		PTREG_OUT_GR(regs, 10),
+		PTREG_OUT_GR(regs, 11),
+		PTREG_OUT_GR(regs, 12),
+		PTREG_OUT_GR(regs, 13),
+		PTREG_OUT_GR(regs, 14),
+		PTREG_OUT_GR(regs, 15),
+		PTREG_OUT_GR(regs, 16),
+		PTREG_OUT_GR(regs, 17),
+		PTREG_OUT_GR(regs, 18),
+		PTREG_OUT_GR(regs, 19),
+		PTREG_OUT_GR(regs, 20),
+		PTREG_OUT_GR(regs, 21),
+		PTREG_OUT_GR(regs, 22),
+		PTREG_OUT_GR(regs, 23),
+		PTREG_OUT_GR(regs, 24),
+		PTREG_OUT_GR(regs, 25),
+		PTREG_OUT_GR(regs, 26),
+		PTREG_OUT_GR(regs, 27),
+		PTREG_OUT(regs, next_frame, next_frame),
+		PTREG_OUT_GR(regs, 29),
+		PTREG_OUT_GR(regs, 30),
+		PTREG_OUT_GR(regs, 31)
+	:
+		"gr0"
+	);
+
+	return regs;
+}
 #endif /* !__ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_PTRACE_H */
--
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