D22767.id65564.diff
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D22767.id65564.diff
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	Index: sys/gdb/gdb_main.c
	===================================================================
	--- sys/gdb/gdb_main.c
	+++ sys/gdb/gdb_main.c
	@@ -131,6 +131,35 @@
	gdb_tx_err(EIO);
	}

	+#ifdef __powerpc__
	+extern vm_offset_t __startkernel;
	+
	+static void
	+gdb_do_offsets(void)
	+{
	+ /*
	+ * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and
	+ * text segment at KERNBASE - SIZEOF_HEADERS.
	+ * On PowerPC64, .text starts at KERNBASE and text segment at
	+ * KERNBASE - 0x100.
	+ * In both cases, the text segment offset is aligned to 64KB.
	+ *
	+ * The __startkernel variable holds the relocated KERNBASE offset.
	+ * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100
	+ * (which would lead to other issues), aligning __startkernel to
	+ * 64KB gives the text segment offset.
	+ *
	+ * TODO: Add DataSeg to response. On PowerPC64 all sections reside
	+ * in a single LOAD segment, but on PowerPC modifiable data reside
	+ * in a separate segment, that GDB should also relocate.
	+ */
	+ gdb_tx_begin(0);
	+ gdb_tx_str("TextSeg=");
	+ gdb_tx_varhex(__startkernel & ~0xffff);
	+ gdb_tx_end();
	+}
	+#endif
	+
	static void
	gdb_do_threadinfo(struct thread **thr_iter)
	{
	@@ -769,6 +798,10 @@
	do_qXfer();
	} else if (gdb_rx_equal("Search:memory:")) {
	gdb_do_mem_search();
	+#ifdef __powerpc__
	+ } else if (gdb_rx_equal("Offsets")) {
	+ gdb_do_offsets();
	+#endif
	} else if (!gdb_cpu_query())
	gdb_tx_empty();
	break;