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Commit 6bfe9661 authored by Franck Bui-Huu's avatar Franck Bui-Huu Committed by Ralf Baechle
Browse files

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



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: default avatarFranck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9432a9ba

arch/mips/kernel/asm-offsets.c

+0 −1
Original line number Diff line number Diff line
@@ -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);

arch/mips/kernel/signal32.c

+0 −1
Original line number Diff line number Diff line
@@ -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++)

include/asm-mips/sigcontext.h

+2 −2
Original line number Diff line number Diff line
@@ -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];