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[MIPS] signal32: no need to save c0_status register in setup_sigcontext32()

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All the information in the MIPS c0_status register is priviledged.
Nothing that would constitute part of the thread context.

The one flag one could possibly argument about might be c0_status.fr
but none of the ABIs or tools or application software can make use
of it.

So for consistency with restore_sigcontext32(), which does not
restore c0_status register, this patch remove the saving part.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Franck Bui-Huu 2007-02-05 15:24:26 +01:00 committed by Ralf Baechle
parent 9432a9ba96
commit 6bfe966160
3 changed files with 2 additions and 4 deletions
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1
arch/mips/kernel/asm-offsets.c
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@ -249,7 +249,6 @@ void output_sc_defines(void)
offset("#define SC_MDHI ", struct sigcontext, sc_mdhi);
offset("#define SC_MDLO ", struct sigcontext, sc_mdlo);
offset("#define SC_PC ", struct sigcontext, sc_pc);
offset("#define SC_STATUS ", struct sigcontext, sc_status);
offset("#define SC_FPC_CSR ", struct sigcontext, sc_fpc_csr);
offset("#define SC_FPC_EIR ", struct sigcontext, sc_fpc_eir);
offset("#define SC_HI1 ", struct sigcontext, sc_hi1);

1
arch/mips/kernel/signal32.c
View file

@ -170,7 +170,6 @@ static int setup_sigcontext32(struct pt_regs *regs,
int i;
err |= __put_user(regs->cp0_epc, &sc->sc_pc);
err |= __put_user(regs->cp0_status, &sc->sc_status);
err |= __put_user(0, &sc->sc_regs[0]);
for (i = 1; i < 32; i++)

4
include/asm-mips/sigcontext.h
View file

@ -19,7 +19,7 @@
*/
struct sigcontext {
unsigned int sc_regmask; /* Unused */
unsigned int sc_status;
unsigned int sc_status; /* Unused */
unsigned long long sc_pc;
unsigned long long sc_regs[32];
unsigned long long sc_fpregs[32];
@ -76,7 +76,7 @@ struct sigcontext {
struct sigcontext32 {
__u32 sc_regmask; /* Unused */
__u32 sc_status;
__u32 sc_status; /* Unused */
__u64 sc_pc;
__u64 sc_regs[32];
__u64 sc_fpregs[32];