15b4f66b0a
Insert two stubs in a BTI enabled binary when fixing long calls: The first is near the call site and uses an indirect jump like before, but it targets the second stub that is near the call target site and uses a direct jump. This is needed when a single stub breaks BTI compatibility. The stub layout is kept fixed between sizing and building the stubs, so the location of the second stub is known at build time, this may introduce padding between stubs when those are relaxed. Stub layout with BTI disabled is unchanged.
63 lines
1.5 KiB
Makefile
63 lines
1.5 KiB
Makefile
#name: Check linker stubs with indirect calls handle BTI (exe).
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#source: bti-far.s
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#as: -mabi=lp64
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#ld: -T bti-far.ld
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#objdump: -dr
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[^:]*: *file format elf64-.*aarch64
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Disassembly of section \.text:
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0000000000020000 <_start>:
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20000: 9400000e bl 20038 <__foo_veneer>
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20004: 94000007 bl 20020 <___veneer>
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20008: 94000001 bl 2000c <baz>
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000000000002000c <baz>:
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2000c: d65f03c0 ret
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20010: 14000010 b 20050 <__foo_veneer\+0x18>
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20014: d503201f nop
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0000000000020018 <___bti_veneer>:
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20018: d503245f bti c
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2001c: 17fffffc b 2000c <baz>
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0000000000020020 <___veneer>:
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20020: 90091910 adrp x16, 12340000 <foo>
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20024: 9100e210 add x16, x16, #0x38
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20028: d61f0200 br x16
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\.\.\.
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0000000000020038 <__foo_veneer>:
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20038: 90091910 adrp x16, 12340000 <foo>
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2003c: 91006210 add x16, x16, #0x18
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20040: d61f0200 br x16
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\.\.\.
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Disassembly of section \.far:
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0000000012340000 <foo>:
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12340000: 94000008 bl 12340020 <___veneer>
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0000000012340004 <bar>:
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12340004: 94000007 bl 12340020 <___veneer>
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12340008: 97fffffe bl 12340000 <foo>
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1234000c: 00000000 udf #0
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12340010: 1400000c b 12340040 <___bti_veneer\+0x8>
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12340014: d503201f nop
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0000000012340018 <__foo_bti_veneer>:
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12340018: d503245f bti c
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1234001c: 17fffff9 b 12340000 <foo>
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0000000012340020 <___veneer>:
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12340020: 90f6e710 adrp x16, 20000 <_start>
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12340024: 91006210 add x16, x16, #0x18
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12340028: d61f0200 br x16
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\.\.\.
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0000000012340038 <___bti_veneer>:
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12340038: d503245f bti c
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1234003c: 17fffff2 b 12340004 <bar>
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