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[AVR] Cherry-pick 17 upstream AVR backend fixes into the Rust LLVM fork #66

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Merged
merged 16 commits into from
Jun 23, 2020
Merged

[AVR] Cherry-pick 17 upstream AVR backend fixes into the Rust LLVM fork #66

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6dfc55b
[AVR] Use correct register class for mul instructions
aykevl Feb 24, 2020
96075fc
[AVR] Don't adjust addresses by 2 for absolute values
aykevl Feb 7, 2020
0ed0823
[AVR] Fix incorrect register state for LDRdPtr
tclin914 Mar 3, 2020
1c0ddae
[AVR] Fix read of uninitialized variable AVRSubtarget:::ELFArch
dylanmckay Mar 12, 2020
954d0a9
[AVR] Fix reads of uninitialized variables from constructor of AVRSub…
dylanmckay Mar 12, 2020
cc42863
[AVR] Respect the 'interrupt' function attribute
dylanmckay Mar 31, 2020
93a3b59
[AVR] Generalize the previous interrupt bugfix to signal handlers too
dylanmckay Mar 31, 2020
65b8b17
[AVR] Do not use divmod calls for bigger integers
aykevl Apr 18, 2020
962c241
[AVR] Do not place functions in .progmem.data
aykevl Apr 15, 2020
93ee4da
[AVR] Fix I/O instructions on XMEGA
dylanmckay May 17, 2020
6b2445d
[LLVM][AVR] Support for R_AVR_6 fixup
dylanmckay May 17, 2020
143e146
[AVR] Fix stack size in functions with a frame pointer
aykevl Apr 21, 2020
cfbe205
[AVR] Remove faulty stack pushing behavior
aykevl Apr 21, 2020
bc27c28
[AVR] Fix miscompilation of zext + add
aykevl Apr 19, 2020
118ac53
[AVR] Don't adjust for instruction size
aykevl Apr 19, 2020
12dfdd3
[AVR] Rewrite the function calling convention.
dylanmckay Jun 19, 2020
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[LLVM][AVR] Support for R_AVR_6 fixup 
Summary: Handle the emission of `R_AVR_6` ELF relocation type.

Reviewers: dylanmckay

Reviewed By: dylanmckay

Subscribers: hiraditya, Jim, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78721

Patch by @LemonBoy https://reviews.llvm.org/p/LemonBoy/
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@dylanmckay
dylanmckay committed Jun 23, 2020
commit 6b2445d841e4c6947b718d0832d2c9c4de646a68
15 changes: 15 additions & 0 deletions llvm/lib/Target/AVR/MCTargetDesc/AVRAsmBackend.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,18 @@ void fixup_13_pcrel(unsigned Size, const MCFixup &Fixup, uint64_t &Value,
Value &= 0xfff;
}

/// 6-bit fixup for the immediate operand of the STD/LDD family of
/// instructions.
///
/// Resolves to:
/// 10q0 qq10 0000 1qqq
static void fixup_6(const MCFixup &Fixup, uint64_t &Value,
MCContext *Ctx = nullptr) {
unsigned_width(6, Value, std::string("immediate"), Fixup, Ctx);

Value = ((Value & 0x20) << 8) | ((Value & 0x18) << 7) | (Value & 0x07);
}

/// 6-bit fixup for the immediate operand of the ADIW family of
/// instructions.
///
Expand Down Expand Up @@ -336,6 +348,9 @@ void AVRAsmBackend::adjustFixupValue(const MCFixup &Fixup,
Value &= 0xffff;
break;

case AVR::fixup_6:
adjust::fixup_6(Fixup, Value, Ctx);
break;
case AVR::fixup_6_adiw:
adjust::fixup_6_adiw(Fixup, Value, Ctx);
break;
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3 changes: 3 additions & 0 deletions llvm/test/MC/AVR/relocations.s
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Expand Up @@ -9,6 +9,9 @@ bar:
; CHECK: R_AVR_LDI SYMBOL+0x3
ldi r21, SYMBOL+3

; CHECK: R_AVR_6 SYMBOL+0x4
ldd r8, Y+SYMBOL+4

; CHECK-NEXT: R_AVR_6_ADIW FOO
adiw r24, FOO

Expand Down