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Mon, 12 Jul 2021 19:00:44 -0700 (PDT) Sender: Bobby Eshleman From: Bobby Eshleman To: xen-devel@lists.xenproject.org Cc: Bobby Eshleman , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Wei Liu , Elena Ufimtseva , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= , Jun Nakajima , Kevin Tian Subject: [PATCH 1/4] build: use common stubs for debugger_trap_* functions if !CONFIG_CRASH_DEBUG Date: Mon, 12 Jul 2021 18:59:53 -0700 Message-Id: <2fc1a1416d37b5eed0ebfdeff8bb9dd61bc7acc7.1626136452.git.bobby.eshleman@gmail.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: References: MIME-Version: 1.0 Previously Xen required all architectures implement the debugger_trap_* functions whether or not it actually needs them. This commit makes debugger_trap* functions resolve to arch-specific function definitions if CONFIG_CRASH_DEBUG=y, but resolves to a set of common no-op stubs if !CONFIG_CRASH_DEBUG, which avoids requiring every arch to carry its own stubs. This means asm/debugger.h may also be dropped for architectures that do not need this functionality. Inside xen/debugger.h: * If !CONFIG_CRASH_DEBUG, use stubs. * Otherwise, include arch-specific Signed-off-by: Bobby Eshleman --- xen/arch/arm/traps.c | 2 +- xen/arch/x86/debug.c | 2 +- xen/arch/x86/domain.c | 5 +- xen/arch/x86/domctl.c | 2 +- xen/arch/x86/gdbstub.c | 4 +- xen/arch/x86/hvm/svm/svm.c | 2 +- xen/arch/x86/hvm/vmx/realmode.c | 2 +- xen/arch/x86/hvm/vmx/vmx.c | 2 +- xen/arch/x86/nmi.c | 2 +- xen/arch/x86/traps.c | 2 +- xen/arch/x86/x86_64/gdbstub.c | 3 +- xen/common/domain.c | 2 +- xen/common/gdbstub.c | 3 +- xen/common/keyhandler.c | 2 +- xen/common/shutdown.c | 2 +- xen/drivers/char/console.c | 2 +- xen/include/asm-arm/debugger.h | 15 ------ xen/include/asm-x86/debugger.h | 66 +++++---------------------- xen/include/xen/debugger.h | 81 +++++++++++++++++++++++++++++++++ 19 files changed, 115 insertions(+), 86 deletions(-) delete mode 100644 xen/include/asm-arm/debugger.h create mode 100644 xen/include/xen/debugger.h diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 4ccb6e7d18..5a0a5eff1d 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -41,7 +41,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/xen/arch/x86/debug.c b/xen/arch/x86/debug.c index d90dc93056..4386e8d1b1 100644 --- a/xen/arch/x86/debug.c +++ b/xen/arch/x86/debug.c @@ -19,7 +19,7 @@ #include #include #include -#include +#include #include typedef unsigned long dbgva_t; diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c index ef1812dc14..47448f2f8c 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -2539,9 +2540,9 @@ static int __init init_vcpu_kick_softirq(void) } __initcall(init_vcpu_kick_softirq); +#ifdef CONFIG_CRASH_DEBUG void domain_pause_for_debugger(void) { -#ifdef CONFIG_CRASH_DEBUG struct vcpu *curr = current; struct domain *d = curr->domain; @@ -2550,8 +2551,8 @@ void domain_pause_for_debugger(void) /* if gdbsx active, we just need to pause the domain */ if ( curr->arch.gdbsx_vcpu_event == 0 ) send_global_virq(VIRQ_DEBUGGER); -#endif } +#endif /* * Local variables: diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c index 26a76d2be9..1bc8ba7251 100644 --- a/xen/arch/x86/domctl.c +++ b/xen/arch/x86/domctl.c @@ -33,7 +33,7 @@ #include #include #include -#include +#include #include #include diff --git a/xen/arch/x86/gdbstub.c b/xen/arch/x86/gdbstub.c index 8f4f49fd3b..f20cbf1f45 100644 --- a/xen/arch/x86/gdbstub.c +++ b/xen/arch/x86/gdbstub.c @@ -18,7 +18,9 @@ * You should have received a copy of the GNU General Public License * along with this program; If not, see . */ -#include +#include +#include +#include u16 gdb_arch_signal_num(struct cpu_user_regs *regs, unsigned long cookie) diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c index 642a64b747..d7ec7c15f9 100644 --- a/xen/arch/x86/hvm/svm/svm.c +++ b/xen/arch/x86/hvm/svm/svm.c @@ -58,7 +58,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/xen/arch/x86/hvm/vmx/realmode.c b/xen/arch/x86/hvm/vmx/realmode.c index cc23afa788..1f8513c132 100644 --- a/xen/arch/x86/hvm/vmx/realmode.c +++ b/xen/arch/x86/hvm/vmx/realmode.c @@ -14,7 +14,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index e09b7e3af9..1820e4be0c 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -51,7 +51,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/xen/arch/x86/nmi.c b/xen/arch/x86/nmi.c index ab94a96c4d..eaf404402d 100644 --- a/xen/arch/x86/nmi.c +++ b/xen/arch/x86/nmi.c @@ -30,7 +30,7 @@ #include #include #include -#include +#include #include #include diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c index e60af16ddd..44811c9599 100644 --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -62,7 +62,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/xen/arch/x86/x86_64/gdbstub.c b/xen/arch/x86/x86_64/gdbstub.c index 2626519c89..126af03f50 100644 --- a/xen/arch/x86/x86_64/gdbstub.c +++ b/xen/arch/x86/x86_64/gdbstub.c @@ -17,7 +17,8 @@ * along with this program; If not, see . */ -#include +#include +#include #define GDB_REG64(r) gdb_write_to_packet_hex(r, sizeof(u64), ctx) #define GDB_REG32(r) gdb_write_to_packet_hex(r, sizeof(u32), ctx) diff --git a/xen/common/domain.c b/xen/common/domain.c index 6b71c6d6a9..88ba680fe7 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -33,7 +33,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/xen/common/gdbstub.c b/xen/common/gdbstub.c index 848c1f4327..6f3d7ca72f 100644 --- a/xen/common/gdbstub.c +++ b/xen/common/gdbstub.c @@ -38,7 +38,8 @@ #include #include #include -#include +#include +#include #include #include #include diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c index 8b9f378371..5c66ca0056 100644 --- a/xen/common/keyhandler.c +++ b/xen/common/keyhandler.c @@ -20,7 +20,7 @@ #include #include #include -#include +#include #include static unsigned char keypress_key; diff --git a/xen/common/shutdown.c b/xen/common/shutdown.c index abde48aa4c..c82a4999d9 100644 --- a/xen/common/shutdown.c +++ b/xen/common/shutdown.c @@ -8,7 +8,7 @@ #include #include #include -#include +#include #include /* opt_noreboot: If true, machine will need manual reset on error. */ diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c index 7d0a603d03..060d32757f 100644 --- a/xen/drivers/char/console.c +++ b/xen/drivers/char/console.c @@ -26,7 +26,7 @@ #include #include #include -#include +#include #include #include /* for do_console_io */ #include diff --git a/xen/include/asm-arm/debugger.h b/xen/include/asm-arm/debugger.h deleted file mode 100644 index ac776efa78..0000000000 --- a/xen/include/asm-arm/debugger.h +++ /dev/null @@ -1,15 +0,0 @@ -#ifndef __ARM_DEBUGGER_H__ -#define __ARM_DEBUGGER_H__ - -#define debugger_trap_fatal(v, r) (0) -#define debugger_trap_immediate() ((void) 0) - -#endif /* __ARM_DEBUGGER_H__ */ -/* - * Local variables: - * mode: C - * c-file-style: "BSD" - * c-basic-offset: 4 - * indent-tabs-mode: nil - * End: - */ diff --git a/xen/include/asm-x86/debugger.h b/xen/include/asm-x86/debugger.h index 99803bfd0c..38359da0a1 100644 --- a/xen/include/asm-x86/debugger.h +++ b/xen/include/asm-x86/debugger.h @@ -1,44 +1,26 @@ /****************************************************************************** - * asm/debugger.h - * - * Generic hooks into arch-dependent Xen. - * - * Each debugger should define two functions here: - * - * 1. debugger_trap_entry(): - * Called at start of any synchronous fault or trap, before any other work - * is done. The idea is that if your debugger deliberately caused the trap - * (e.g. to implement breakpoints or data watchpoints) then you can take - * appropriate action and return a non-zero value to cause early exit from - * the trap function. - * - * 2. debugger_trap_fatal(): - * Called when Xen is about to give up and crash. Typically you will use this - * hook to drop into a debug session. It can also be used to hook off - * deliberately caused traps (which you then handle and return non-zero). + * x86 Debugger Hooks * - * 3. debugger_trap_immediate(): - * Called if we want to drop into a debugger now. This is essentially the - * same as debugger_trap_fatal, except that we use the current register state - * rather than the state which was in effect when we took the trap. - * For example: if we're dying because of an unhandled exception, we call - * debugger_trap_fatal; if we're dying because of a panic() we call - * debugger_trap_immediate(). + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; If not, see . */ - #ifndef __X86_DEBUGGER_H__ #define __X86_DEBUGGER_H__ -#include #include #include +#include +#include +#include +#include void domain_pause_for_debugger(void); -#ifdef CONFIG_CRASH_DEBUG - -#include - static inline bool debugger_trap_fatal( unsigned int vector, struct cpu_user_regs *regs) { @@ -74,28 +56,4 @@ static inline bool debugger_trap_entry( return false; } -#else - -static inline bool debugger_trap_fatal( - unsigned int vector, struct cpu_user_regs *regs) -{ - return false; -} - -#define debugger_trap_immediate() ((void)0) - -static inline bool debugger_trap_entry( - unsigned int vector, struct cpu_user_regs *regs) -{ - return false; -} - -#endif - -#ifdef CONFIG_GDBSX -unsigned int dbg_rw_mem(unsigned long gva, XEN_GUEST_HANDLE_PARAM(void) buf, - unsigned int len, domid_t domid, bool toaddr, - uint64_t pgd3); -#endif - #endif /* __X86_DEBUGGER_H__ */ diff --git a/xen/include/xen/debugger.h b/xen/include/xen/debugger.h new file mode 100644 index 0000000000..d6d820f4e5 --- /dev/null +++ b/xen/include/xen/debugger.h @@ -0,0 +1,81 @@ +/****************************************************************************** + * Generic hooks into arch-dependent Xen. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; If not, see . + * + * + * Each debugger should define three functions here: + * + * 1. debugger_trap_entry(): + * Called at start of any synchronous fault or trap, before any other work + * is done. The idea is that if your debugger deliberately caused the trap + * (e.g. to implement breakpoints or data watchpoints) then you can take + * appropriate action and return a non-zero value to cause early exit from + * the trap function. + * + * 2. debugger_trap_fatal(): + * Called when Xen is about to give up and crash. Typically you will use this + * hook to drop into a debug session. It can also be used to hook off + * deliberately caused traps (which you then handle and return non-zero). + * + * 3. debugger_trap_immediate(): + * Called if we want to drop into a debugger now. This is essentially the + * same as debugger_trap_fatal, except that we use the current register state + * rather than the state which was in effect when we took the trap. + * For example: if we're dying because of an unhandled exception, we call + * debugger_trap_fatal; if we're dying because of a panic() we call + * debugger_trap_immediate(). + */ + +#ifndef __XEN_DEBUGGER_H__ +#define __XEN_DEBUGGER_H__ + +/* Dummy value used by ARM stubs. */ +#ifndef TRAP_invalid_op +# define TRAP_invalid_op 6 +#endif + +#ifdef CONFIG_CRASH_DEBUG + +#include + +#else + +#include +#include + +static inline void domain_pause_for_debugger(void) +{ +} + +static inline bool debugger_trap_fatal( + unsigned int vector, const struct cpu_user_regs *regs) +{ + return false; +} + +static inline void debugger_trap_immediate(void) +{ +} + +static inline bool debugger_trap_entry( + unsigned int vector, const struct cpu_user_regs *regs) +{ + return false; +} + +#endif /* CONFIG_CRASH_DEBUG */ + +#ifdef CONFIG_GDBSX +unsigned int dbg_rw_mem(unsigned long gva, XEN_GUEST_HANDLE_PARAM(void) buf, + unsigned int len, domid_t domid, bool toaddr, + uint64_t pgd3); +#endif /* CONFIG_GDBSX */ + +#endif /* __XEN_DEBUGGER_H__ */