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To support thumb1 execute-only code we need to support four new relocations (R_ARM_THM_ALU_ABS_G0_NC, R_ARM_THM_ALU_ABS_G1_NC, R_ARM_THM_ALU_ABS_G2_NC and R_ARM_THM_ALU_ABS_G3_NC). These relocations allow the static linker to finalize construction of symbol address. Typical sequence of code to get address of the symbol foo is then the following : movs r3, #:upper8_15:#foo lsls r3, #8 adds r3, #:upper0_7:#foo lsls r3, #8 adds r3, #:lower8_15:#foo lsls r3, #8 adds r3, #:lower0_7:#foo This will give following sequence of text and relocations after assembly : 4: 2300 movs r3, #0 4: R_ARM_THM_ALU_ABS_G3_NC foo 6: 021b lsls r3, r3, #8 8: 3300 adds r3, #0 8: R_ARM_THM_ALU_ABS_G2_NC foo a: 021b lsls r3, r3, #8 c: 3300 adds r3, #0 c: R_ARM_THM_ALU_ABS_G1_NC foo e: 021b lsls r3, r3, #8 10: 3300 adds r3, #0 10: R_ARM_THM_ALU_ABS_G0_NC foo
39 lines
953 B
Makefile
39 lines
953 B
Makefile
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.*: file format.*
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Disassembly of section .text:
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00008000 <[^>]*>:
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8000: 2012 movs r0, #18
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8002: 2134 movs r1, #52 ; 0x34
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8004: 2280 movs r2, #128 ; 0x80
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8006: 2301 movs r3, #1
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8008: 2401 movs r4, #1
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800a: 2500 movs r5, #0
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800c: 2600 movs r6, #0
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800e: 2700 movs r7, #0
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00008010 <[^>]*>:
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8010: 2012 movs r0, #18
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8012: 2100 movs r1, #0
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8014: 2281 movs r2, #129 ; 0x81
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8016: 2320 movs r3, #32
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8018: 2700 movs r7, #0
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801a: 2600 movs r6, #0
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801c: 2581 movs r5, #129 ; 0x81
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801e: 2422 movs r4, #34 ; 0x22
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00008020 <[^>]*>:
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8020: 01 .byte 0x01
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00008021 <[^>]*>:
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8021: 02 .byte 0x02
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Disassembly of section .far:
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12340000 <[^>]*>:
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12340000: 2000 movs r0, #0
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12340002: 2100 movs r1, #0
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12340004: 2200 movs r2, #0
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12340006: 2301 movs r3, #1
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