diff options
| author | Mickael Guene <mickael.guene@st.com> | 2015-12-16 10:09:05 +0100 |
|---|---|---|
| committer | Christophe Lyon <christophe.lyon@linaro.org> | 2015-12-16 10:19:51 +0100 |
| commit | 72d98d16ed09584660d0cbb759d90f8dfeef2343 (patch) | |
| tree | 6a1f1e78ca24f2306e718025bf4d90d891956880 /bfd/bfd-in2.h | |
| parent | 9c35a5290213e9a28e6cc691e1cc7ba5055653f7 (diff) | |
| download | gdb-72d98d16ed09584660d0cbb759d90f8dfeef2343.zip gdb-72d98d16ed09584660d0cbb759d90f8dfeef2343.tar.gz gdb-72d98d16ed09584660d0cbb759d90f8dfeef2343.tar.bz2 | |
[ARM] Add support for thumb1 pcrop relocations.
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
Diffstat (limited to 'bfd/bfd-in2.h')
| -rw-r--r-- | bfd/bfd-in2.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h index 606d11b..39eb19a 100644 --- a/bfd/bfd-in2.h +++ b/bfd/bfd-in2.h @@ -3516,6 +3516,12 @@ pc-relative or some form of GOT-indirect relocation. */ /* ARM support for STT_GNU_IFUNC. */ BFD_RELOC_ARM_IRELATIVE, +/* Thumb1 relocations to support execute-only code. */ + BFD_RELOC_ARM_THUMB_ALU_ABS_G0_NC, + BFD_RELOC_ARM_THUMB_ALU_ABS_G1_NC, + BFD_RELOC_ARM_THUMB_ALU_ABS_G2_NC, + BFD_RELOC_ARM_THUMB_ALU_ABS_G3_NC, + /* These relocs are only used within the ARM assembler. They are not (at present) written to any object files. */ BFD_RELOC_ARM_IMMEDIATE, |