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commit 0ff3e01fdc67a3842ee54224cf197e9a55f0a750
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Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
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Date: Tue Feb 4 18:34:19 2014 +0100
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PowerPC64 little-endian fixes: 128-bit DFP parameters / registers
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The powerpc64le-linux ABI specifies that when a 128-bit DFP value is
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passed in a pair of floating-point registers, the first register holds
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the most-significant part of the value. This is as opposed to the
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usual rule on little-endian systems, where the first register would
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hold the least-significant part.
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This affects two places in GDB, the read/write routines for the
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128-bit DFP pseudo-registers, and the function call / return
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sequence. For the former, current code already distinguishes
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between big- and little-endian targets, but gets the latter
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wrong. This is presumably because *GCC* also got it wrong,
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and GDB matches the old GCC behavior. But GCC is now fixed:
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http://gcc.gnu.org/ml/gcc-patches/2013-11/msg02145.html
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so GDB needs to be fixed too. (Old code shouldn't really be
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an issue since there is no code "out there" so far that uses
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dfp128 on little-endian ...)
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gdb/ChangeLog:
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* ppc-sysv-tdep.c (ppc64_sysv_abi_push_freg): Use correct order
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within a register pair holding a DFP 128-bit value on little-endian.
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(ppc64_sysv_abi_return_value_base): Likewise.
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* rs6000-tdep.c (dfp_pseudo_register_read): Likewise.
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(dfp_pseudo_register_write): Likewise.
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gdb/testsuite/ChangeLog:
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* gdb.arch/powerpc-d128-regs.exp: Enable on powerpc64*-*.
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Index: gdb-7.6.1/gdb/ppc-sysv-tdep.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/ppc-sysv-tdep.c
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+++ gdb-7.6.1/gdb/ppc-sysv-tdep.c
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@@ -1269,9 +1269,11 @@ ppc64_sysv_abi_push_freg (struct gdbarch
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if (argpos->regcache && argpos->freg <= 12)
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{
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int regnum = tdep->ppc_fp0_regnum + argpos->freg;
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+ int lopart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 8 : 0;
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+ int hipart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 0 : 8;
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- regcache_cooked_write (argpos->regcache, regnum, val);
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- regcache_cooked_write (argpos->regcache, regnum + 1, val + 8);
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+ regcache_cooked_write (argpos->regcache, regnum, val + hipart);
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+ regcache_cooked_write (argpos->regcache, regnum + 1, val + lopart);
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}
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argpos->freg += 2;
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@@ -1684,16 +1686,18 @@ ppc64_sysv_abi_return_value_base (struct
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&& TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT)
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{
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int regnum = tdep->ppc_fp0_regnum + 2 + 2 * index;
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+ int lopart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 8 : 0;
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+ int hipart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 0 : 8;
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if (writebuf != NULL)
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{
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- regcache_cooked_write (regcache, regnum, writebuf);
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- regcache_cooked_write (regcache, regnum + 1, writebuf + 8);
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+ regcache_cooked_write (regcache, regnum, writebuf + hipart);
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+ regcache_cooked_write (regcache, regnum + 1, writebuf + lopart);
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}
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if (readbuf != NULL)
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{
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- regcache_cooked_read (regcache, regnum, readbuf);
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- regcache_cooked_read (regcache, regnum + 1, readbuf + 8);
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+ regcache_cooked_read (regcache, regnum, readbuf + hipart);
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+ regcache_cooked_read (regcache, regnum + 1, readbuf + lopart);
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}
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return 1;
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}
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Index: gdb-7.6.1/gdb/rs6000-tdep.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/rs6000-tdep.c
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+++ gdb-7.6.1/gdb/rs6000-tdep.c
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@@ -2723,10 +2723,10 @@ dfp_pseudo_register_read (struct gdbarch
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else
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{
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status = regcache_raw_read (regcache, tdep->ppc_fp0_regnum +
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- 2 * reg_index + 1, buffer + 8);
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+ 2 * reg_index + 1, buffer);
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if (status == REG_VALID)
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status = regcache_raw_read (regcache, tdep->ppc_fp0_regnum +
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- 2 * reg_index, buffer);
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+ 2 * reg_index, buffer + 8);
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}
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return status;
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@@ -2752,9 +2752,9 @@ dfp_pseudo_register_write (struct gdbarc
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else
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{
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regcache_raw_write (regcache, tdep->ppc_fp0_regnum +
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- 2 * reg_index + 1, buffer + 8);
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+ 2 * reg_index + 1, buffer);
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regcache_raw_write (regcache, tdep->ppc_fp0_regnum +
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- 2 * reg_index, buffer);
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+ 2 * reg_index, buffer + 8);
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}
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}
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Index: gdb-7.6.1/gdb/testsuite/gdb.arch/powerpc-d128-regs.exp
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===================================================================
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--- gdb-7.6.1.orig/gdb/testsuite/gdb.arch/powerpc-d128-regs.exp
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+++ gdb-7.6.1/gdb/testsuite/gdb.arch/powerpc-d128-regs.exp
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@@ -20,7 +20,7 @@
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# Testcase for ppc decimal128 pseudo-registers.
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-if ![istarget "powerpc64-*"] then {
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+if ![istarget "powerpc64*-*"] then {
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verbose "Skipping powerpc Decimal128 pseudo-registers testcase."
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return
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}
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