In gcc/config/m68k/linux-unwind.h, the function m68k_fallback_frame_state() has
the following:
if (*(int *) sc->sc_fpstate)
{
int *fpregs = (int *) sc->sc_fpregs;
fs->regs.reg[16].how = REG_SAVED_OFFSET;
fs->regs.reg[16].loc.offset = (long) &fpregs[0] - cfa;
fs->regs.reg[17].how = REG_SAVED_OFFSET;
fs->regs.reg[17].loc.offset = (long) &fpregs[M68K_FP_SIZE/4] - cfa;
}
The variable "sc" is of type "struct sigcontext", which is defined the linux
kernel headers in asm/sigcontext.h. For asm-m68k, the sigcontext structure has
members sc_fpregs, sc_fpcntl, and sc_fpstate. For asm-m68knommu, the sigcontext
structure does not have the sc_fp... members. This causes the gcc build to
break in libgcc when the asm-m68knommu kernel headers are used. This is so with
the uClinux 2.4 kernel and the vanilla linux 2.6 kernel.
I'm not too familiar with the code in linux-unwind.h, but one solution might be
to wrap the above code in an "#ifdef __mcffpu__".
--
Summary: m68k/coldfire gcc build breaks due to sc_fpstate,
sc_fpregs reference
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kendallc at vxitech dot com
GCC target triplet: m68k-unknown-uclinux-uclibc
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36070
