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2003-06-21 Andrew Cagney <cagney@redhat.com>

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* mips-tdep.c (mips_find_saved_regs): Rewrite mdebug code handling
	32 bit floating-point register saves.
This commit is contained in:
Andrew Cagney 2003-06-21 18:02:54 +00:00
parent 6e51443a2a
commit c57bb9fa3e
2 changed files with 36 additions and 17 deletions
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3
gdb/ChangeLog
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@ -1,5 +1,8 @@
2003-06-21 Andrew Cagney <cagney@redhat.com>
* mips-tdep.c (mips_find_saved_regs): Rewrite mdebug code handling
32 bit floating-point register saves.
* frame.h (deprecated_unwind_get_saved_register): Delete.
* frame.c (deprecated_unwind_get_saved_register): Delete function.
* mips-tdep.c (mips_get_saved_register): Use frame_register_unwind

50
gdb/mips-tdep.c
View File

@ -1607,28 +1607,44 @@ mips_find_saved_regs (struct frame_info *fci)
CORE_ADDR reg_position = (get_frame_base (fci)
+ PROC_FREG_OFFSET (proc_desc));
/* Apparently, the freg_offset gives the offset to the first 64
bit saved.
When the ABI specifies 64 bit saved registers, the FREG_OFFSET
designates the first saved 64 bit register.
When the ABI specifies 32 bit saved registers, the ``64 bit
saved DOUBLE'' consists of two adjacent 32 bit registers, Hence
FREG_OFFSET, designates the address of the lower register of
the register pair. Adjust the offset so that it designates the
upper register of the pair -- i.e., the address of the first
saved 32 bit register. */
if (MIPS_SAVED_REGSIZE == 4)
reg_position += MIPS_SAVED_REGSIZE;
/* Fill in the offsets for the float registers which float_mask
says were saved. */
for (ireg = MIPS_NUMREGS - 1; float_mask; --ireg, float_mask <<= 1)
if (float_mask & 0x80000000)
{
set_reg_offset (saved_regs, FP0_REGNUM + ireg, reg_position);
if (MIPS_SAVED_REGSIZE == 4 && TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
/* On a big endian 32 bit ABI, floating point registers
are paired to form doubles such that the most
significant part is in $f[N+1] and the least
significant in $f[N] vis: $f[N+1] ||| $f[N]. The
registers are also spilled as a pair and stored as a
double.
When little-endian the least significant part is
stored first leading to the memory order $f[N] and
then $f[N+1].
Unfortunatly, when big-endian the most significant
part of the double is stored first, and the least
significant is stored second. This leads to the
registers being ordered in memory as firt $f[N+1] and
then $f[N].
For the big-endian case make certain that the
addresses point at the correct (swapped) locations
$f[N] and $f[N+1] pair (keep in mind that
reg_position is decremented each time through the
loop). */
if ((ireg & 1))
set_reg_offset (saved_regs, FP0_REGNUM + ireg,
reg_position - MIPS_SAVED_REGSIZE);
else
set_reg_offset (saved_regs, FP0_REGNUM + ireg,
reg_position + MIPS_SAVED_REGSIZE);
}
else
set_reg_offset (saved_regs, FP0_REGNUM + ireg, reg_position);
reg_position -= MIPS_SAVED_REGSIZE;
}