This is the mail archive of the
binutils@sources.redhat.com
mailing list for the binutils project.
DWARF2 exception doesn't work with gcc and gas on MIPS.
- To: gcc at gcc dot gnu dot org, binutils at sourceware dot cygnus dot com,linux-mips at oss dot sgi dot com
- Subject: DWARF2 exception doesn't work with gcc and gas on MIPS.
- From: "H . J . Lu" <hjl at lucon dot org>
- Date: Wed, 13 Jun 2001 21:29:40 -0700
In the MIPS gas, there is
case M_JAL_A:
if (mips_pic == NO_PIC)
macro_build ((char *) NULL, &icnt, &offset_expr, "jal", "a");
else if (mips_pic == SVR4_PIC)
{
/* If this is a reference to an external symbol, and we are
using a small GOT, we want
lw $25,<sym>($gp) (BFD_RELOC_MIPS_CALL16)
nop
jalr $25
nop
lw $gp,cprestore($sp)
The cprestore value is set using the .cprestore
pseudo-op. If we are using a big GOT, we want
lui $25,<sym> (BFD_RELOC_MIPS_CALL_HI16)
addu $25,$25,$gp
lw $25,<sym>($25) (BFD_RELOC_MIPS_CALL_LO16)
nop
jalr $25
nop
lw $gp,cprestore($sp)
If the symbol is not external, we want
lw $25,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $25,$25,<sym> (BFD_RELOC_LO16)
jalr $25
nop
lw $gp,cprestore($sp) */
When gcc emits
$LEHB5:
la $25,foobar
jal $31,$25
$LEHE5:
It doesn't work since
jal $31,$25
is expanded to
jalr $25
nop
lw $gp,cprestore($sp)
Now we have
$LEHB5:
la $25,foobar
jalr $25
nop
lw $gp,cprestore($sp)
$LEHE5:
When foobar throws an exception, GP won't get restored. What we want is
$LEHB5:
la $25,foobar
jalr $25
nop
$LEHE5:
lw $gp,cprestore($sp)
Does anyone have any suggestions how to fix it?
Thanks.
H.J.