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618655192f
Ensure that injection of a stub section does not break a link where there is an xpectation that flow of control can pass from one input section to another simply by linking the input sections in series. The solution here is to allow stub sections to be inserted after any input section (existing behaviour), but inject an additional branch at the start of each stub section such that control flow falling into the stub section will branch over the stub section.
75 lines
2.1 KiB
Makefile
75 lines
2.1 KiB
Makefile
#name: aarch64-farcall-back
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#source: farcall-back.s
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#as:
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#ld: -Ttext 0x1000 --section-start .foo=0x100000000
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#notarget: aarch64_be-*-*
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#objdump: -dr
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#...
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Disassembly of section .text:
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0000000000001000 <_start>:
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1000: 14000413 b 204c <__bar1_veneer>
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1004: 94000412 bl 204c <__bar1_veneer>
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1008: 14000407 b 2024 <__bar2_veneer>
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100c: 94000406 bl 2024 <__bar2_veneer>
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1010: 14000409 b 2034 <__bar3_veneer>
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1014: 94000408 bl 2034 <__bar3_veneer>
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1018: d65f03c0 ret
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...
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000000000000201c <_back>:
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201c: d65f03c0 ret
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[ \t]+2020:[ \t]+14000013[ \t]+b[ \t]+206c <__bar1_veneer\+0x20>
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0000000000002024 <__bar2_veneer>:
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2024: f07ffff0 adrp x16, 100001000 <bar1\+0x1000>
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2028: 91002210 add x16, x16, #0x8
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202c: d61f0200 br x16
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2030: 00000000 .inst 0x00000000 ; undefined
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0000000000002034 <__bar3_veneer>:
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2034: 58000090 ldr x16, 2044 <__bar3_veneer\+0x10>
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2038: 10000011 adr x17, 2038 <__bar3_veneer\+0x4>
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203c: 8b110210 add x16, x16, x17
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2040: d61f0200 br x16
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2044: ffffffd8 .word 0xffffffd8
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2048: 00000000 .word 0x00000000
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000000000000204c <__bar1_veneer>:
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204c: d07ffff0 adrp x16, 100000000 <bar1>
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2050: 91000210 add x16, x16, #0x0
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2054: d61f0200 br x16
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...
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Disassembly of section .foo:
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0000000100000000 <bar1>:
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100000000: d65f03c0 ret
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100000004: 14000806 b 10000201c <___start_veneer>
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...
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0000000100001008 <bar2>:
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100001008: d65f03c0 ret
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10000100c: 14000404 b 10000201c <___start_veneer>
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...
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0000000100002010 <bar3>:
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100002010: d65f03c0 ret
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100002014: 14000008 b 100002034 <___back_veneer>
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[ \t]+100002018:[ \t]+1400000d[ \t]+b[ \t]+10000204c <___back_veneer\+0x18>
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000000010000201c <___start_veneer>:
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10000201c: 58000090 ldr x16, 10000202c <___start_veneer\+0x10>
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100002020: 10000011 adr x17, 100002020 <___start_veneer\+0x4>
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100002024: 8b110210 add x16, x16, x17
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100002028: d61f0200 br x16
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10000202c: ffffefe0 .word 0xffffefe0
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100002030: fffffffe .word 0xfffffffe
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0000000100002034 <___back_veneer>:
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100002034: 90800010 adrp x16, 2000 <_start\+0x1000>
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100002038: 91007210 add x16, x16, #0x1c
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10000203c: d61f0200 br x16
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...
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