Support powerpc64le (gh-35).

.github/workflows/ci.yml

@@ -181,3 +181,13 @@ jobs:
  run: sudo apt-get update && sudo apt-get install qemu-user gcc-powerpc64-linux-gnu g++-powerpc64-linux-gnu binutils-powerpc64-linux-gnu libc6-ppc64-powerpc-cross libc6-dev-ppc64-powerpc-cross
  - name: Run tests
  run: scripts/travis.sh
+ powerpc64le:
+ runs-on: ubuntu-latest
+ env:
+ ARCH: powerpc64le-linux-gnu
+ steps:
+ - uses: actions/checkout@v3
+ - name: Install deps
+ run: sudo apt-get update && sudo apt-get install qemu-user gcc-powerpc64le-linux-gnu g++-powerpc64le-linux-gnu binutils-powerpc64le-linux-gnu libc6-ppc64el-cross libc6-dev-ppc64el-cross
+ - name: Run tests
+ run: scripts/travis.sh

README.md

@@ -47,7 +47,7 @@ where `TARGET` can be any of
  * mipsel-linux-gnu
  * mips64el-linux-gnuabi64
  * e2k-linux-gnu
- * powerpc64-linux-gnu (preliminary support)
+ * powerpc64-linux-gnu, powerpc64le-linux-gnu (preliminary support)
 
 Script generates two files: `libxyz.so.tramp.S` and `libxyz.so.init.c` which need to be linked to your application (instead of `-lxyz`):
 

arch/powerpc64le/config.ini

@@ -0,0 +1,3 @@
+[Arch]
+PointerSize = 8
+SymbolReloc = R_PPC64_ADDR64

arch/powerpc64le/table.S.tpl

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2024 Yury Gribov
+ *
+ * The MIT License (MIT)
+ *
+ * Use of this source code is governed by MIT license that can be
+ * found in the LICENSE.txt file.
+ */
+
+ .machine power9
+ .abiversion 2
+
+ .section .note.GNU-stack,"",@progbits
+
+ .data
+
+ .globl _${lib_suffix}_tramp_table
+ .hidden _${lib_suffix}_tramp_table
+ .align 8
+_${lib_suffix}_tramp_table:
+ .zero $table_size
+
+ .section ".toc","aw"
+ .align 3
+.LC0:
+ .quad _${lib_suffix}_tramp_table
+
+ .section ".text"
+
+ .globl _${lib_suffix}_tramp_resolve
+ .hidden _${lib_suffix}_tramp_resolve
+
+ .globl _${lib_suffix}_save_regs_and_resolve
+ .hidden _${lib_suffix}_save_regs_and_resolve
+ .type _${lib_suffix}_save_regs_and_resolve, %function
+
+_${lib_suffix}_save_regs_and_resolve:
+ .cfi_startproc
+.LCF0:
+ addis 2, 12, .TOC. - .LCF0@ha
+ addi 2, 2, .TOC. - .LCF0@l
+ .localentry _${lib_suffix}_save_regs_and_resolve, . - _${lib_suffix}_save_regs_and_resolve
+
+ // Slow path which calls dlsym, taken only on first call.
+ // Registers are saved acc. to PPC64 ELF ABI
+ // For DWARF directives, read https://www.imperialviolet.org/2017/01/18/cfi.html.
+
+ mflr 0
+ std 0, 16(1)
+
+ ld 0, 48-8(1)
+
+ std 3, -8(1)
+ std 4, -16(1)
+ std 5, -24(1)
+ std 6, -32(1)
+ std 7, -40(1)
+ std 8, -48(1)
+ std 9, -56(1)
+ std 10, -64(1)
+
+ stfd 1, -72(1)
+ stfd 2, -80(1)
+ stfd 3, -88(1)
+ stfd 4, -96(1)
+ stfd 5, -104(1)
+ stfd 6, -112(1)
+ stfd 7, -120(1)
+ stfd 8, -128(1)
+ stfd 9, -136(1)
+ stfd 10, -144(1)
+ stfd 11, -152(1)
+ stfd 12, -160(1)
+ stfd 13, -168(1)
+
+ // TODO: also save Altivec registers
+
+ stdu 1, -256(1)
+
+ .cfi_def_cfa_offset 256
+ .cfi_offset r3, -8
+ .cfi_offset r4, -16
+ .cfi_offset r5, -24
+ .cfi_offset r6, -32
+ .cfi_offset r7, -40
+ .cfi_offset r8, -48
+ .cfi_offset r9, -56
+ .cfi_offset r10, -64
+ .cfi_offset f1, -72
+ .cfi_offset f2, -80
+ .cfi_offset f3, -88
+ .cfi_offset f4, -96
+ .cfi_offset f5, -104
+ .cfi_offset f6, -112
+ .cfi_offset f7, -120
+ .cfi_offset f8, -128
+ .cfi_offset f9, -136
+ .cfi_offset f10, -144
+ .cfi_offset f11, -152
+ .cfi_offset f12, -160
+ .cfi_offset f13, -168
+
+ mr 3, 0
+
+ bl _${lib_suffix}_tramp_resolve
+ nop
+
+ addi 1, 1, 256
+ .cfi_def_cfa_offset 0
+
+ ld 3, -8(1)
+ ld 4, -16(1)
+ ld 5, -24(1)
+ ld 6, -32(1)
+ ld 7, -40(1)
+ ld 8, -48(1)
+ ld 9, -56(1)
+ ld 10, -64(1)
+
+ lfd 1, -72(1)
+ lfd 2, -80(1)
+ lfd 3, -88(1)
+ lfd 4, -96(1)
+ lfd 5, -104(1)
+ lfd 6, -112(1)
+ lfd 7, -120(1)
+ lfd 8, -128(1)
+ lfd 9, -136(1)
+ lfd 10, -144(1)
+ lfd 11, -152(1)
+ lfd 12, -160(1)
+ lfd 13, -168(1)
+
+ ld 0, 16(1)
+ mtlr 0
+
+ .cfi_restore r3
+ .cfi_restore r4
+ .cfi_restore r5
+ .cfi_restore r6
+ .cfi_restore r7
+ .cfi_restore r8
+ .cfi_restore r9
+ .cfi_restore r10
+ .cfi_restore f1
+ .cfi_restore f2
+ .cfi_restore f3
+ .cfi_restore f4
+ .cfi_restore f5
+ .cfi_restore f6
+ .cfi_restore f7
+ .cfi_restore f8
+ .cfi_restore f9
+ .cfi_restore f10
+ .cfi_restore f11
+ .cfi_restore f12
+ .cfi_restore f13
+
+ blr
+
+ .cfi_endproc

arch/powerpc64le/trampoline.S.tpl

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2024 Yury Gribov
+ *
+ * The MIT License (MIT)
+ *
+ * Use of this source code is governed by MIT license that can be
+ * found in the LICENSE.txt file.
+ */
+
+ .globl $sym
+ .p2align 4
+ .type $sym, %function
+#ifndef IMPLIB_EXPORT_SHIMS
+ .hidden $sym
+#endif
+
+$sym:
+ .cfi_startproc
+.$sym.LCF0:
+ addis 2, 12, .TOC. - .$sym.LCF0@ha
+ addi 2, 2, .TOC. - .$sym.LCF0@l
+ .localentry $sym, . - $sym
+
+1:
+ // Load address
+ addis 12, 2, .LC0@toc@ha
+ ld 12, .LC0@toc@l(12)
+ ld 12, $offset(12)
+
+ cmpdi 12, 0
+ beq 3f
+
+2: // "Fast" path
+ // TODO: can we get rid of prologue/epilogue here?
+
+ mflr 0
+ std 0, 16(1)
+ stdu 1, -112(1)
+ .cfi_def_cfa_offset 112
+ .cfi_offset lr, 16
+
+ std 2, 24(1)
+
+ mtctr 12
+ bctrl
+
+ ld 2, 24(1)
+ addi 1, 1, 112
+ .cfi_def_cfa_offset 0
+ ld 0, 16(1)
+ mtlr 0
+ .cfi_restore lr
+ blr
+
+3: // Slow path
+
+ mflr 0
+ std 0, 16(1)
+
+ li 0, $number
+ std 0, -8(1)
+
+ stdu 1, -48(1)
+ .cfi_def_cfa_offset 48
+ .cfi_offset lr, 16
+
+ bl _${lib_suffix}_save_regs_and_resolve
+ nop
+
+ addi 1, 1, 48
+ .cfi_def_cfa_offset 0
+
+ ld 0, 16(1)
+ mtlr 0
+ .cfi_restore lr
+
+ b 1b
+
+ .cfi_endproc

implib-gen.py

@@ -77,6 +77,7 @@ def collect_syms(f):
  syms_set = set()
  for line in out.splitlines():
  line = line.strip()
+ line = re.sub(r'\[<localentry>: [0-9]+\]', '', line) # Strip out strange markers in powerpc64le ELFs
  if not line:
  # Next symtab
  toc = None
@@ -374,7 +375,7 @@ def main():
  parser.add_argument('--target',
  help="Target platform triple e.g. x86_64-unknown-linux-gnu or arm-none-eabi "
  "(atm x86_64, i[0-9]86, arm/armhf/armeabi, aarch64/armv8, "
- "mips/mipsel, mips64/mip64el, e2k and powerpc64 are supported)",
+ "mips/mipsel, mips64/mip64el, e2k, powerpc64/powerpc64le are supported)",
  default=os.uname()[-1])
  parser.add_argument('--symbol-list',
  help="Path to file with symbols that should be present in wrapper "
@@ -406,6 +407,8 @@ def main():
  target = 'mips64' # Handle mips64-..., mips64el-..., mips64le-...
  elif args.target.startswith('mips'):
  target = 'mips' # Handle mips-..., mipsel-..., mipsle-...
+ elif args.target.startswith('ppc64le'):
+ target = 'powerpc64le'
  elif args.target.startswith('ppc64'):
  target = 'powerpc64'
  else:

tests/common.sh

@@ -59,6 +59,11 @@ else
  PREFIX=powerpc64-linux-gnu-
  INTERP="qemu-ppc64 -L /usr/powerpc64-linux-gnu -E LD_LIBRARY_PATH=.${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
  ;;
+ ppc64le | powerpc64le | powerpc64le-*)
+ TARGET=powerpc64le
+ PREFIX=powerpc64le-linux-gnu-
+ INTERP="qemu-ppc64le -L /usr/powerpc64le-linux-gnu -E LD_LIBRARY_PATH=.${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+ ;;
  *)
  echo >&2 "Unsupported target: $ARCH"
  exit 1