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author | Keir Fraser <keir.fraser@citrix.com> | 2010-02-24 10:44:30 +0000 |
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committer | Keir Fraser <keir.fraser@citrix.com> | 2010-02-24 10:44:30 +0000 |
commit | 5040f46e36bc8b38784f32e4f7ca497274e08324 (patch) | |
tree | 074d301847bff14e11eb42cfeba5da7978274d9a | |
parent | 078a073a6ccd4f6a66cce154ecaeceaa39c28b78 (diff) | |
download | xen-5040f46e36bc8b38784f32e4f7ca497274e08324.tar.gz xen-5040f46e36bc8b38784f32e4f7ca497274e08324.tar.bz2 xen-5040f46e36bc8b38784f32e4f7ca497274e08324.zip |
x86: Generalise BUGFRAME_dump mechanism to allow polled UART irq to
get proper regs argument.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
-rw-r--r-- | xen/arch/x86/traps.c | 28 | ||||
-rw-r--r-- | xen/drivers/acpi/utilities/utglobal.c | 1 | ||||
-rw-r--r-- | xen/drivers/char/ns16550.c | 18 | ||||
-rw-r--r-- | xen/include/asm-x86/bug.h | 9 | ||||
-rw-r--r-- | xen/include/asm-x86/processor.h | 1 |
5 files changed, 38 insertions, 19 deletions
diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c index fda92163d4..932ff43a69 100644 --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -892,6 +892,7 @@ asmlinkage void do_invalid_op(struct cpu_user_regs *regs) { struct bug_frame bug; struct bug_frame_str bug_str; + const void *p; const char *filename, *predicate, *eip = (char *)regs->eip; unsigned long fixup; int id, lineno; @@ -913,26 +914,29 @@ asmlinkage void do_invalid_op(struct cpu_user_regs *regs) goto die; eip += sizeof(bug); + /* Decode first pointer argument. */ + if ( !is_kernel(eip) || + __copy_from_user(&bug_str, eip, sizeof(bug_str)) || + (bug_str.mov != 0xbc) ) + goto die; + p = bug_str(bug_str, eip); + if ( !is_kernel(p) ) + goto die; + eip += sizeof(bug_str); + id = bug.id & 3; - if ( id == BUGFRAME_dump ) + if ( id == BUGFRAME_run_fn ) { - show_execution_state(regs); + const void (*fn)(struct cpu_user_regs *) = p; + (*fn)(regs); regs->eip = (unsigned long)eip; return; } /* WARN, BUG or ASSERT: decode the filename pointer and line number. */ - if ( !is_kernel(eip) || - __copy_from_user(&bug_str, eip, sizeof(bug_str)) || - (bug_str.mov != 0xbc) ) - goto die; - filename = bug_str(bug_str, eip); - eip += sizeof(bug_str); - - if ( !is_kernel(filename) ) - filename = "<unknown>"; - lineno = bug.id >> 2; + filename = p; + lineno = bug.id >> 2; if ( id == BUGFRAME_warn ) { diff --git a/xen/drivers/acpi/utilities/utglobal.c b/xen/drivers/acpi/utilities/utglobal.c index 8cb5e8de3e..2f792000ff 100644 --- a/xen/drivers/acpi/utilities/utglobal.c +++ b/xen/drivers/acpi/utilities/utglobal.c @@ -45,6 +45,7 @@ #include <xen/config.h> #include <xen/lib.h> +#include <asm/processor.h> #include <acpi/acpi.h> #include <acpi/acnamesp.h> diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c index a819a80da6..f1981a24ba 100644 --- a/xen/drivers/char/ns16550.c +++ b/xen/drivers/char/ns16550.c @@ -145,11 +145,13 @@ static void ns16550_interrupt( } } -static void ns16550_poll(void *data) +/* Safe: ns16550_poll() runs in softirq context so not reentrant on a given CPU. */ +static DEFINE_PER_CPU(struct serial_port *, poll_port); + +static void __ns16550_poll(struct cpu_user_regs *regs) { - struct serial_port *port = data; + struct serial_port *port = this_cpu(poll_port); struct ns16550 *uart = port->uart; - struct cpu_user_regs *regs = guest_cpu_user_regs(); if ( uart->intr_works ) return; /* Interrupts work - no more polling */ @@ -169,6 +171,16 @@ static void ns16550_poll(void *data) set_timer(&uart->timer, NOW() + MILLISECS(uart->timeout_ms)); } +static void ns16550_poll(void *data) +{ + this_cpu(poll_port) = data; +#ifdef run_in_exception_handler + run_in_exception_handler(__ns16550_poll); +#else + __ns16550_poll(guest_cpu_user_regs()); +#endif +} + static int ns16550_tx_empty(struct serial_port *port) { struct ns16550 *uart = port->uart; diff --git a/xen/include/asm-x86/bug.h b/xen/include/asm-x86/bug.h index df64549e44..60efca2244 100644 --- a/xen/include/asm-x86/bug.h +++ b/xen/include/asm-x86/bug.h @@ -13,15 +13,16 @@ struct bug_frame { unsigned short id; /* BUGFRAME_??? */ } __attribute__((packed)); -#define BUGFRAME_dump 0 +#define BUGFRAME_run_fn 0 #define BUGFRAME_warn 1 #define BUGFRAME_bug 2 #define BUGFRAME_assert 3 -#define dump_execution_state() \ +#define run_in_exception_handler(fn) \ asm volatile ( \ - "ud2 ; ret $0" \ - : : "i" (BUGFRAME_dump) ) + "ud2 ; ret %0" BUG_STR(1) \ + : : "i" (BUGFRAME_run_fn), \ + "i" (fn) ) #define WARN() \ asm volatile ( \ diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h index 90d8806b65..62f8aea880 100644 --- a/xen/include/asm-x86/processor.h +++ b/xen/include/asm-x86/processor.h @@ -535,6 +535,7 @@ void show_stack(struct cpu_user_regs *regs); void show_stack_overflow(unsigned int cpu, unsigned long esp); void show_registers(struct cpu_user_regs *regs); void show_execution_state(struct cpu_user_regs *regs); +#define dump_execution_state() run_in_exception_handler(show_execution_state) void show_page_walk(unsigned long addr); asmlinkage void fatal_trap(int trapnr, struct cpu_user_regs *regs); |