33 lines
1.4 KiB
Diff
33 lines
1.4 KiB
Diff
commit 17ee540dd61113fe4f557f191db3480db875cca1
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Author: Mark Wielaard <mark@klomp.org>
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Date: Wed Apr 18 15:00:24 2018 +0200
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Make kernel DWARF unwinder work with ksalr.
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The .debug_frame loaded from disk is already relocated against the
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expected load offset of the kernel, but the actual static (load)
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address might be different (with kaslr). So adjust the startLoc
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for that difference when reading any address from the unwind table.
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diff --git a/runtime/unwind.c b/runtime/unwind.c
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index 3a2d991..4c360d2 100644
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--- a/runtime/unwind.c
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+++ b/runtime/unwind.c
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@@ -724,10 +724,15 @@ adjustStartLoc (unsigned long startLoc,
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dbug_unwind(2, "adjustStartLoc=%lx, ptrType=%s, m=%s, s=%s eh=%d\n",
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startLoc, _stp_eh_enc_name(ptrType), m->path, s->name, is_ehframe);
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if (startLoc == 0
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- || strcmp (m->name, "kernel") == 0
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|| (strcmp (s->name, ".absolute") == 0 && !is_ehframe))
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return startLoc;
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+ /* The .debug_frame loaded from disk is already relocated against the
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+ expected load offset of the kernel, but the actual static (load)
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+ address might be different (with kaslr). */
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+ if (strcmp (m->name, "kernel") == 0)
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+ return startLoc - s->sec_load_offset + s->static_addr;
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+
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/* eh_frame data has been loaded in the kernel, so readjust offset. */
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if (is_ehframe) {
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dbug_unwind(2, "eh_frame=%lx, eh_frame_addr=%lx\n", (unsigned long) m->eh_frame, m->eh_frame_addr);
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