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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 01/13] Export hypervisor symbols
Export Xen's symbols in format similar to Linux' /proc/kallsyms.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
xen/arch/x86/platform_hypercall.c | 9 +++++
xen/arch/x86/x86_64/platform_hypercall.c | 2 +-
xen/common/symbols-dummy.c | 1 +
xen/common/symbols.c | 58 ++++++++++++++++++++++++++++++--
xen/include/public/platform.h | 22 ++++++++++++
xen/include/xen/symbols.h | 4 +++
xen/tools/symbols.c | 4 +++
7 files changed, 97 insertions(+), 3 deletions(-)
diff --git a/xen/arch/x86/platform_hypercall.c
b/xen/arch/x86/platform_hypercall.c
index 7175a82..39376fe 100644
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -23,6 +23,7 @@
#include <xen/cpu.h>
#include <xen/pmstat.h>
#include <xen/irq.h>
+#include <xen/symbols.h>
#include <asm/current.h>
#include <public/platform.h>
#include <acpi/cpufreq/processor_perf.h>
@@ -597,6 +598,14 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
}
break;
+ case XENPF_get_symbols:
+ {
+ ret = xensyms_read(&op->u.symdata);
+ if ( ret >= 0 && __copy_field_to_guest(u_xenpf_op, op, u.symdata) )
+ ret = -EFAULT;
+ }
+ break;
+
default:
ret = -ENOSYS;
break;
diff --git a/xen/arch/x86/x86_64/platform_hypercall.c
b/xen/arch/x86/x86_64/platform_hypercall.c
index aa2ad54..9ef705a 100644
--- a/xen/arch/x86/x86_64/platform_hypercall.c
+++ b/xen/arch/x86/x86_64/platform_hypercall.c
@@ -35,7 +35,7 @@ CHECK_pf_pcpu_version;
#undef xen_pf_pcpu_version
#define xenpf_enter_acpi_sleep compat_pf_enter_acpi_sleep
-
+#define xenpf_symdata compat_pf_symdata
#define COMPAT
#define _XEN_GUEST_HANDLE(t) XEN_GUEST_HANDLE(t)
#define _XEN_GUEST_HANDLE_PARAM(t) XEN_GUEST_HANDLE_PARAM(t)
diff --git a/xen/common/symbols-dummy.c b/xen/common/symbols-dummy.c
index 5090c3b..52a86c7 100644
--- a/xen/common/symbols-dummy.c
+++ b/xen/common/symbols-dummy.c
@@ -12,6 +12,7 @@ const unsigned int symbols_offsets[1];
const unsigned long symbols_addresses[1];
#endif
const unsigned int symbols_num_syms;
+const unsigned long symbols_names_bytes;
const u8 symbols_names[1];
const u8 symbols_token_table[1];
diff --git a/xen/common/symbols.c b/xen/common/symbols.c
index 83b2b58..e74a585 100644
--- a/xen/common/symbols.c
+++ b/xen/common/symbols.c
@@ -17,6 +17,8 @@
#include <xen/lib.h>
#include <xen/string.h>
#include <xen/spinlock.h>
+#include <public/platform.h>
+#include <xen/guest_access.h>
#ifdef SYMBOLS_ORIGIN
extern const unsigned int symbols_offsets[1];
@@ -26,6 +28,7 @@ extern const unsigned long symbols_addresses[];
#define symbols_address(n) symbols_addresses[n]
#endif
extern const unsigned int symbols_num_syms;
+extern const unsigned long symbols_names_bytes;
extern const u8 symbols_names[];
extern const u8 symbols_token_table[];
@@ -35,7 +38,8 @@ extern const unsigned int symbols_markers[];
/* expand a compressed symbol data into the resulting uncompressed string,
given the offset to where the symbol is in the compressed stream */
-static unsigned int symbols_expand_symbol(unsigned int off, char *result)
+static unsigned int symbols_expand_symbol(unsigned int off, char *result,
+ int maxlen)
{
int len, skipped_first = 0;
const u8 *tptr, *data;
@@ -49,6 +53,9 @@ static unsigned int symbols_expand_symbol(unsigned int off,
char *result)
* the compressed stream */
off += len + 1;
+ if (maxlen < len)
+ len = maxlen;
+
/* for every byte on the compressed symbol data, copy the table
entry for that byte */
while(len) {
@@ -129,7 +136,7 @@ const char *symbols_lookup(unsigned long addr,
--low;
/* Grab name */
- symbols_expand_symbol(get_symbol_offset(low), namebuf);
+ symbols_expand_symbol(get_symbol_offset(low), namebuf, sizeof(namebuf));
/* Search for next non-aliased symbol */
for (i = low + 1; i < symbols_num_syms; i++) {
@@ -174,3 +181,50 @@ void __print_symbol(const char *fmt, unsigned long address)
spin_unlock_irqrestore(&lock, flags);
}
+
+/*
+ * Get symbol type information. This is encoded as a single char at the
+ * beginning of the symbol name.
+ */
+static char symbols_get_symbol_type(unsigned int off)
+{
+ /*
+ * Get just the first code, look it up in the token table,
+ * and return the first char from this token.
+ */
+ return symbols_token_table[symbols_token_index[symbols_names[off + 1]]];
+}
+
+/*
+ * Symbols are most likely accessed sequentially so we remember position from
+ * previous read. This can help us avoid extra call to get_symbol_offset().
+ */
+static uint64_t next_symbol, next_offset;
+static DEFINE_SPINLOCK(symbols_mutex);
+
+int xensyms_read(struct xenpf_symdata *symdata)
+{
+ if ( symdata->xen_symnum > symbols_num_syms )
+ return -EINVAL;
+ else if ( symdata->xen_symnum == symbols_num_syms )
+ return 0;
+
+ spin_lock(&symbols_mutex);
+
+ if ( symdata->xen_symnum == 0 )
+ next_offset = next_symbol = 0;
+ else if ( next_symbol != symdata->xen_symnum )
+ /* Non-sequential access */
+ next_offset = get_symbol_offset(symdata->xen_symnum);
+
+ symdata->type = symbols_get_symbol_type(next_offset);
+ next_offset = symbols_expand_symbol(next_offset, symdata->name,
+ sizeof(symdata->name));
+ symdata->address = symbols_offsets[symdata->xen_symnum] + SYMBOLS_ORIGIN;
+
+ next_symbol = symdata->xen_symnum + 1;
+
+ spin_unlock(&symbols_mutex);
+
+ return strlen(symdata->name);
+}
diff --git a/xen/include/public/platform.h b/xen/include/public/platform.h
index 4341f54..870e14b 100644
--- a/xen/include/public/platform.h
+++ b/xen/include/public/platform.h
@@ -527,6 +527,27 @@ struct xenpf_core_parking {
typedef struct xenpf_core_parking xenpf_core_parking_t;
DEFINE_XEN_GUEST_HANDLE(xenpf_core_parking_t);
+#define XENPF_get_symbols 61
+
+struct xenpf_symdata {
+ /* IN variables */
+ uint64_t xen_symnum;
+
+ /* OUT variables */
+ uint64_t address;
+ uint64_t type;
+ /*
+ * KSYM_NAME_LEN is 128 bytes. However, we cannot be larger than pad in
+ * xen_platform_op below (which is 128 bytes as well). Since the largest
+ * symbol is around 50 bytes it's probably more trouble than it's worth
+ * to try to deal with symbols that are close to 128 bytes in length.
+ */
+#define XEN_SYMS_MAX_LEN (128 - 3 * 8)
+ char name[XEN_SYMS_MAX_LEN];
+};
+typedef struct xenpf_symdata xenpf_symdata_t;
+DEFINE_XEN_GUEST_HANDLE(xenpf_symdata_t);
+
/*
* ` enum neg_errnoval
* ` HYPERVISOR_platform_op(const struct xen_platform_op*);
@@ -553,6 +574,7 @@ struct xen_platform_op {
struct xenpf_cpu_hotadd cpu_add;
struct xenpf_mem_hotadd mem_add;
struct xenpf_core_parking core_parking;
+ struct xenpf_symdata symdata;
uint8_t pad[128];
} u;
};
diff --git a/xen/include/xen/symbols.h b/xen/include/xen/symbols.h
index 37cf6bf..c8df28f 100644
--- a/xen/include/xen/symbols.h
+++ b/xen/include/xen/symbols.h
@@ -2,6 +2,8 @@
#define _XEN_SYMBOLS_H
#include <xen/types.h>
+#include <public/xen.h>
+#include <public/platform.h>
#define KSYM_NAME_LEN 127
@@ -34,4 +36,6 @@ do { \
__print_symbol(fmt, addr); \
} while(0)
+extern int xensyms_read(struct xenpf_symdata *symdata);
+
#endif /*_XEN_SYMBOLS_H*/
diff --git a/xen/tools/symbols.c b/xen/tools/symbols.c
index f39c906..818204d 100644
--- a/xen/tools/symbols.c
+++ b/xen/tools/symbols.c
@@ -272,6 +272,10 @@ static void write_src(void)
}
printf("\n");
+ output_label("symbols_names_bytes");
+ printf("\t.long\t%d\n", off);
+ printf("\n");
+
output_label("symbols_markers");
for (i = 0; i < ((table_cnt + 255) >> 8); i++)
printf("\t.long\t%d\n", markers[i]);
--
1.8.1.4
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