# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1267009865 0
# Node ID 3ccf3e993d5ddc4e5dff15e464dc63d5485e984c
# Parent cddd503fb25401fdaabe1344fdf5e060ca158e7a
x86: Generalise BUGFRAME_dump mechanism to allow polled UART irq to
get proper regs argument.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
xen-unstable changeset: 20969:8cb6e7eff2ba
xen-unstable date: Wed Feb 24 10:44:30 2010 +0000
---
xen/arch/x86/traps.c | 32 ++++++++++++++++++--------------
xen/drivers/acpi/utilities/utglobal.c | 1 +
xen/drivers/char/ns16550.c | 22 +++++++++++++++++-----
xen/include/asm-x86/bug.h | 9 +++++----
xen/include/asm-x86/processor.h | 1 +
5 files changed, 42 insertions(+), 23 deletions(-)
diff -r cddd503fb254 -r 3ccf3e993d5d xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c Wed Feb 24 11:10:09 2010 +0000
+++ b/xen/arch/x86/traps.c Wed Feb 24 11:11:05 2010 +0000
@@ -840,6 +840,7 @@ asmlinkage void do_invalid_op(struct cpu
{
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;
@@ -860,26 +861,29 @@ asmlinkage void do_invalid_op(struct cpu
goto die;
eip += sizeof(bug);
- id = bug.id & 3;
-
- if ( id == BUGFRAME_dump )
- {
- show_execution_state(regs);
- regs->eip = (unsigned long)eip;
- return;
- }
-
- /* WARN, BUG or ASSERT: decode the filename pointer and line number. */
+ /* Decode first pointer argument. */
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);
+ p = bug_str(bug_str, eip);
+ if ( !is_kernel(p) )
+ goto die;
eip += sizeof(bug_str);
- if ( !is_kernel(filename) )
- filename = "<unknown>";
- lineno = bug.id >> 2;
+ id = bug.id & 3;
+
+ if ( id == BUGFRAME_run_fn )
+ {
+ 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. */
+ filename = p;
+ lineno = bug.id >> 2;
if ( id == BUGFRAME_warn )
{
diff -r cddd503fb254 -r 3ccf3e993d5d xen/drivers/acpi/utilities/utglobal.c
--- a/xen/drivers/acpi/utilities/utglobal.c Wed Feb 24 11:10:09 2010 +0000
+++ b/xen/drivers/acpi/utilities/utglobal.c Wed Feb 24 11:11:05 2010 +0000
@@ -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 -r cddd503fb254 -r 3ccf3e993d5d xen/drivers/char/ns16550.c
--- a/xen/drivers/char/ns16550.c Wed Feb 24 11:10:09 2010 +0000
+++ b/xen/drivers/char/ns16550.c Wed Feb 24 11:11:05 2010 +0000
@@ -144,11 +144,13 @@ static void ns16550_interrupt(
}
}
-static void ns16550_poll(void *data)
-{
- struct serial_port *port = data;
- struct ns16550 *uart = port->uart;
- struct cpu_user_regs *regs = guest_cpu_user_regs();
+/* 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 = this_cpu(poll_port);
+ struct ns16550 *uart = port->uart;
if ( uart->intr_works )
return; /* Interrupts work - no more polling */
@@ -166,6 +168,16 @@ static void ns16550_poll(void *data)
serial_tx_interrupt(port, regs);
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)
diff -r cddd503fb254 -r 3ccf3e993d5d xen/include/asm-x86/bug.h
--- a/xen/include/asm-x86/bug.h Wed Feb 24 11:10:09 2010 +0000
+++ b/xen/include/asm-x86/bug.h Wed Feb 24 11:11:05 2010 +0000
@@ -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 -r cddd503fb254 -r 3ccf3e993d5d xen/include/asm-x86/processor.h
--- a/xen/include/asm-x86/processor.h Wed Feb 24 11:10:09 2010 +0000
+++ b/xen/include/asm-x86/processor.h Wed Feb 24 11:11:05 2010 +0000
@@ -532,6 +532,7 @@ void show_stack_overflow(unsigned int cp
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);
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