[Crash-utility] [PATCH 11/12] crash-trace-command: implement older syscall_get_exit_fields()

Older kernel use older syscall_get_exit_fields(). Implement(emulate) for it! Signed-off-by: Lai Jiangshan <laijs(a)cn.fujitsu.com&gt; --- diff --git a/extensions/trace.c b/extensions/trace.c index 3bad4af..e04c504 100755 --- a/extensions/trace.c +++ b/extensions/trace.c @@ -697,6 +697,38 @@ work: return 0; } +static int syscall_get_exit_fields_old(ulong call, ulong *fields) +{ + static int inited; + static int data_offset; + static int exit_fields_offset; + + ulong metadata; + + if (inited) + goto work; + + inited = 1; + data_offset = MEMBER_OFFSET("ftrace_event_call", "data"); + if (data_offset < 0) + return -1; + + exit_fields_offset = MEMBER_OFFSET("syscall_metadata", "exit_fields"); + if (exit_fields_offset < 0) + return -1; + +work: + if (data_offset < 0 || exit_fields_offset < 0) + return -1; + + if (!readmem(call + data_offset, KVADDR, &metadata, sizeof(metadata), + "read ftrace_event_call data", RETURN_ON_ERROR)) + return -1; + + *fields = metadata + exit_fields_offset; + return 0; +} + static int syscall_get_exit_fields(ulong call, ulong *fields) { static int inited; @@ -714,7 +746,7 @@ static int syscall_get_exit_fields(ulong call, ulong *fields) } if (inited == -1) - return -1; + return syscall_get_exit_fields_old(call, fields); *fields = syscall_exit_fields_value;