Partially work around bug with passing arguments on stack for powerpc…

…64-linux-gnu.

README.md

@@ -47,7 +47,8 @@ where `TARGET` can be any of
   * mipsel-linux-gnu
   * mips64el-linux-gnuabi64
   * e2k-linux-gnu
-  * powerpc64-linux-gnu, powerpc64le-linux-gnu (preliminary support)
+  * powerpc64le-linux-gnu
+  * powerpc64-linux-gnu (limited 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/powerpc64/trampoline.S.tpl

@@ -37,24 +37,44 @@ $sym:
 
   // TODO:
   // We need to somehow get rid of additional stack frame
-  // because it breaks arguments which are passed on stack
+  // because it breaks arguments which are passed on stack.
+  // Currently we work around this by duplicating parameters
+  // in new stack frame but this supports only 16 parameters
+  // and is very inefficient.
 
   mflr 0
   std 0, 16(1)
-  stdu 1, -112(1)
-  .cfi_def_cfa_offset 112
+  stdu 1, -176(1)
+  .cfi_def_cfa_offset 176
   .cfi_offset lr, 16
 
   std 2, 40(1)
 
+  ld 0, 176+112(1)
+  std 0, 112(1)
+  ld 0, 176+120(1)
+  std 0, 120(1)
+  ld 0, 176+128(1)
+  std 0, 128(1)
+  ld 0, 176+136(1)
+  std 0, 136(1)
+  ld 0, 176+144(1)
+  std 0, 144(1)
+  ld 0, 176+152(1)
+  std 0, 152(1)
+  ld 0, 176+160(1)
+  std 0, 160(1)
+  ld 0, 176+168(1)
+  std 0, 168(1)
+
   ld 2, 8(11)
   ld 11, 0(11)
 
   mtctr 11
   bctrl
 
   ld 2, 40(1)
-  addi 1, 1, 112
+  addi 1, 1, 176
   .cfi_def_cfa_offset 0
   ld 0, 16(1)
   mtlr 0

scripts/travis.sh

@@ -40,7 +40,4 @@ tests/multiple-dlopens-3/run.sh $ARCH
 if ! echo "$ARCH" | grep -q powerpc; then
   tests/many-functions/run.sh $ARCH
 fi
-if ! echo "$ARCH" | grep -q 'powerpc64-'; then
-  # FIXME: enable for all platforms !
-  tests/stack-args/run.sh $ARCH
-fi
+tests/stack-args/run.sh $ARCH