Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753693Ab0DLGHZ (ORCPT ); Mon, 12 Apr 2010 02:07:25 -0400 Received: from sj-iport-5.cisco.com ([171.68.10.87]:6787 "EHLO sj-iport-5.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753615Ab0DLGHK (ORCPT ); Mon, 12 Apr 2010 02:07:10 -0400 Authentication-Results: sj-iport-5.cisco.com; dkim=neutral (message not signed) header.i=none X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AvsEACZVwkurR7H+/2dsb2JhbACbM3GhRZgUhQwEgyU X-IronPort-AV: E=Sophos;i="4.52,188,1270425600"; d="scan'208";a="181522491" Date: Sun, 11 Apr 2010 23:07:10 -0700 From: David VomLehn To: to@dvomlehn-lnx2.corp.sa.net, "linux-arch@vger.kernel.org"@cisco.com, linux-arch@vger.kernel.org Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, maint_arch@dvomlehn-lnx2.corp.sa.net Subject: [PATCH 20/23] Make register values available to Sparc panic notifiers Message-ID: <20100412060710.GA25825@dvomlehn-lnx2.corp.sa.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7522 Lines: 251 The save_ptregs() function has not been tested or even built. I will need help to complete this. Signed-off-by: David VomLehn --- arch/sparc/include/asm/ptrace.h | 161 +++++++++++++++++++++++++++++++++++++++ arch/sparc/kernel/traps_32.c | 3 +- arch/sparc/kernel/traps_64.c | 11 ++- 3 files changed, 169 insertions(+), 6 deletions(-) diff --git a/arch/sparc/include/asm/ptrace.h b/arch/sparc/include/asm/ptrace.h index 30b0b79..7303ebf 100644 --- a/arch/sparc/include/asm/ptrace.h +++ b/arch/sparc/include/asm/ptrace.h @@ -420,6 +420,167 @@ extern void show_regs(struct pt_regs *); #define GR_SNAP_THREAD 0x30 #define GR_SNAP_PAD1 0x38 +/* Macros for saving the contents of registers and for the output constraint + * for those registers */ +#include + +#if defined(__sparc__) && defined(__arch64__) +#define PTREG_SAVE(r, name) "stx " #r ", %[" #name "]\n" +#else +#define PTREG_SAVE(r, name) "st " #r ", %[" #name "]\n" +#endif + +#define PTREG_SAVE_U(i) PTREG_SAVE_IDX(%g, u_regs, i) + +#define PTREG_OUT_U(regs, i) PTREG_OUT_IDX(regs, %g, u_regs, 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. + */ +#if defined(__sparc__) && defined(__arch64__) +static __always_inline +const struct pt_regs *save_ptregs(struct pt_regs *regs) +{ + __asm__ __volatile__ ( + PTREG_SAVE_U(0) + PTREG_SAVE_U(1) + PTREG_SAVE_U(2) + PTREG_SAVE_U(3) + PTREG_SAVE_U(4) + PTREG_SAVE_U(5) + PTREG_SAVE_U(6) + PTREG_SAVE_U(7) + PTREG_SAVE_U(8) + PTREG_SAVE_U(9) + PTREG_SAVE_U(10) + PTREG_SAVE_U(11) + PTREG_SAVE_U(12) + PTREG_SAVE_U(13) + PTREG_SAVE_U(14) + PTREG_SAVE_U(15) + PTREG_SAVE(tstate, tstate) + PTREG_SAVE(tpc, tpc) + PTREG_SAVE(tnpc, tnpc) + PTREG_SAVE(y, y) + PTREG_SAVE(magic, magic) + /* + * The current location is the one for which the register + * values are correct, even if some had been modified on + * function entry. So, the current location is the value to + * save as the execution address. + */ + "1:\n" + "sethi %%hi(1b), %g7\n" + "or %g7, %lo(1b), %g7\n" + PTREG_SAVE(%g7, tpc) + : + PTREG_OUT_U(0), + PTREG_OUT_U(1), + PTREG_OUT_U(2), + PTREG_OUT_U(3), + PTREG_OUT_U(4), + PTREG_OUT_U(5), + PTREG_OUT_U(6), + PTREG_OUT_U(7), + PTREG_OUT_U(8), + PTREG_OUT_U(9), + PTREG_OUT_U(10), + PTREG_OUT_U(11), + PTREG_OUT_U(12), + PTREG_OUT_U(13), + PTREG_OUT_U(14), + PTREG_OUT_U(15), + PTREG_OUT(regs, tstate, tstate), + PTREG_OUT(regs, tpc, tpc), + PTREG_OUT(regs, tnpc, tnpc), + PTREG_OUT(regs, y, y), + PTREG_OUT(regs, magic, magic) + : + "g7" + ); + + return regs; +} +#else +/** + * 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_U(0) + PTREG_SAVE_U(1) + PTREG_SAVE_U(2) + PTREG_SAVE_U(3) + PTREG_SAVE_U(4) + PTREG_SAVE_U(5) + PTREG_SAVE_U(6) + PTREG_SAVE_U(7) + PTREG_SAVE_U(8) + PTREG_SAVE_U(9) + PTREG_SAVE_U(10) + PTREG_SAVE_U(11) + PTREG_SAVE_U(12) + PTREG_SAVE_U(13) + PTREG_SAVE_U(14) + PTREG_SAVE_U(15) + PTREG_SAVE(psr, psr) + PTREG_SAVE(pc, pc) + PTREG_SAVE(npc, npc) + PTREG_SAVE(y, y) + PTREG_SAVE(magic, magic) + /* + * The current location is the one for which the register + * values are correct, even if some had been modified on + * function entry. So, the current location is the value to + * save as the execution address. + */ + : + PTREG_OUT_U(0), + PTREG_OUT_U(1), + PTREG_OUT_U(2), + PTREG_OUT_U(3), + PTREG_OUT_U(4), + PTREG_OUT_U(5), + PTREG_OUT_U(6), + PTREG_OUT_U(7), + PTREG_OUT_U(8), + PTREG_OUT_U(9), + PTREG_OUT_U(10), + PTREG_OUT_U(11), + PTREG_OUT_U(12), + PTREG_OUT_U(13), + PTREG_OUT_U(14), + PTREG_OUT_U(15), + PTREG_OUT(regs, psr, psr), + PTREG_OUT(regs, pc, pc), + PTREG_OUT(regs, npc, npc), + PTREG_OUT(regs, y, y), + PTREG_OUT(regs, magic, magic) + : + ); + + return regs; +} +#endif /* (defined(__sparc__) && defined(__arch64__)) */ + #endif /* __KERNEL__ */ /* Stuff for the ptrace system call */ diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c index c0490c7..9b41e2f 100644 --- a/arch/sparc/kernel/traps_32.c +++ b/arch/sparc/kernel/traps_32.c @@ -353,7 +353,8 @@ void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc pc, npc, psr); #endif if(psr & PSR_PS) - panic("Tell me what a watchpoint trap is, and I'll then deal " + panic_with_regs(regs, + "Tell me what a watchpoint trap is, and I'll then deal " "with such a beast..."); } diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c index 10f7bb9..c4035d3 100644 --- a/arch/sparc/kernel/traps_64.c +++ b/arch/sparc/kernel/traps_64.c @@ -1347,7 +1347,7 @@ void cheetah_fecc_handler(struct pt_regs *regs, unsigned long afsr, unsigned lon cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable); if (!recoverable) - panic("Irrecoverable Fast-ECC error trap.\n"); + panic_with_regs(regs, "Irrecoverable Fast-ECC error trap.\n"); /* Flush E-cache to kick the error trap handlers out. */ cheetah_flush_ecache(); @@ -1525,7 +1525,8 @@ void cheetah_cee_handler(struct pt_regs *regs, unsigned long afsr, unsigned long cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable); if (!recoverable) - panic("Irrecoverable Correctable-ECC error trap.\n"); + panic_with_regs(regs, + "Irrecoverable Correctable-ECC error trap.\n"); } void cheetah_deferred_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar) @@ -1712,7 +1713,7 @@ void cheetah_deferred_handler(struct pt_regs *regs, unsigned long afsr, unsigned } if (!recoverable) - panic("Irrecoverable deferred error trap.\n"); + panic_with_regs(regs, "Irrecoverable deferred error trap.\n"); } /* Handle a D/I cache parity error trap. TYPE is encoded as: @@ -1747,7 +1748,7 @@ void cheetah_plus_parity_error(int type, struct pt_regs *regs) (type & 0x1) ? 'I' : 'D', regs->tpc); printk(KERN_EMERG "TPC<%pS>\n", (void *) regs->tpc); - panic("Irrecoverable Cheetah+ parity error."); + panic_with_regs(regs, "Irrecoverable Cheetah+ parity error."); } printk(KERN_WARNING "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]\n", @@ -1934,7 +1935,7 @@ void sun4v_nonresum_error(struct pt_regs *regs, unsigned long offset) KERN_EMERG "NON-RESUMABLE ERROR", &sun4v_nonresum_oflow_cnt); - panic("Non-resumable error."); + panic_with_regs(regs, "Non-resumable error."); } /* If we try to printk() we'll probably make matters worse, by trying -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/