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Commit d270acbc authored by Keith Owens's avatar Keith Owens Committed by Tony Luck
Browse files

[IA64] Sanitize assembler code for ia64_sal_os_state 



struct ia64_sal_os_state has three semi-independent sections.  The code
in mca_asm.S assumes that these three sections are contiguous, which
makes it very awkward to add new data to this structure.  Remove the
assumption that the sections are contiguous.  Define a macro to shorten
references to offsets in ia64_sal_os_state.

This patch does not change the way that the code behaves.  It just
makes it easier to update the code in future and to add fields to
ia64_sal_os_state when debugging the MCA/INIT handlers.

Signed-off-by: default avatarKeith Owens <kaos@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent b7bb575c

arch/ia64/kernel/asm-offsets.c

+12 −4
Original line number Diff line number Diff line
@@ -217,16 +217,24 @@ void foo(void) 
	DEFINE(IA64_MCA_CPU_INIT_STACK_OFFSET,

	       offsetof (struct ia64_mca_cpu, init_stack));

	BLANK();

	DEFINE(IA64_SAL_OS_STATE_COMMON_OFFSET,

	       offsetof (struct ia64_sal_os_state, sal_ra));

	DEFINE(IA64_SAL_OS_STATE_OS_GP_OFFSET,

	       offsetof (struct ia64_sal_os_state, os_gp));

	DEFINE(IA64_SAL_OS_STATE_PAL_MIN_STATE_OFFSET,

	       offsetof (struct ia64_sal_os_state, pal_min_state));

	DEFINE(IA64_SAL_OS_STATE_PROC_STATE_PARAM_OFFSET,

	       offsetof (struct ia64_sal_os_state, proc_state_param));

	DEFINE(IA64_SAL_OS_STATE_SAL_RA_OFFSET,

	       offsetof (struct ia64_sal_os_state, sal_ra));

	DEFINE(IA64_SAL_OS_STATE_SAL_GP_OFFSET,

	       offsetof (struct ia64_sal_os_state, sal_gp));

	DEFINE(IA64_SAL_OS_STATE_PAL_MIN_STATE_OFFSET,

	       offsetof (struct ia64_sal_os_state, pal_min_state));

	DEFINE(IA64_SAL_OS_STATE_OS_STATUS_OFFSET,

	       offsetof (struct ia64_sal_os_state, os_status));

	DEFINE(IA64_SAL_OS_STATE_CONTEXT_OFFSET,

	       offsetof (struct ia64_sal_os_state, context));

	DEFINE(IA64_SAL_OS_STATE_SIZE,

	       sizeof (struct ia64_sal_os_state));

	BLANK();



	DEFINE(IA64_PMSA_GR_OFFSET,

	       offsetof (struct pal_min_state_area_s, pmsa_gr));

	DEFINE(IA64_PMSA_BANK1_GR_OFFSET,

arch/ia64/kernel/entry.h

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 


#define PT(f)		(IA64_PT_REGS_##f##_OFFSET)

#define SW(f)		(IA64_SWITCH_STACK_##f##_OFFSET)

#define SOS(f)		(IA64_SAL_OS_STATE_##f##_OFFSET)



#define PT_REGS_SAVES(off)			\

	.unwabi 3, 'i';				\

arch/ia64/kernel/mca_asm.S

+17 −11
Original line number Diff line number Diff line
@@ -159,7 +159,7 @@ ia64_os_mca_spin: 
	GET_IA64_MCA_DATA(r2)

	// Using MCA stack, struct ia64_sal_os_state, variable proc_state_param

	;;

	add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+IA64_SAL_OS_STATE_PROC_STATE_PARAM_OFFSET, r2

	add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2

	;;

	ld8 r18=[r3]				// Get processor state parameter on existing PALE_CHECK.

	;;
@@ -479,9 +479,11 @@ ia64_state_save: 
	st8 [temp2]=r11,16	// rv_rc

	mov r11=cr.iipa

	;;

	st8 [temp1]=r18,16	// proc_state_param

	st8 [temp2]=r19,16	// monarch

	st8 [temp1]=r18		// proc_state_param

	st8 [temp2]=r19		// monarch

	mov r6=IA64_KR(CURRENT)

	add temp1=SOS(SAL_RA), regs

	add temp2=SOS(SAL_GP), regs

	;;

	st8 [temp1]=r12,16	// sal_ra

	st8 [temp2]=r10,16	// sal_gp
@@ -503,12 +505,14 @@ ia64_state_save: 
	st8 [temp2]=r11,16	// cr.iipa

	mov r12=cr.iim

	;;

	st8 [temp1]=r12,16	// cr.iim

	st8 [temp1]=r12		// cr.iim

(p1)	mov r12=IA64_MCA_COLD_BOOT

(p2)	mov r12=IA64_INIT_WARM_BOOT

	mov r6=cr.iha

	add temp1=SOS(OS_STATUS), regs

	;;

	st8 [temp2]=r6,16	// cr.iha

	st8 [temp2]=r6		// cr.iha

	add temp2=SOS(CONTEXT), regs

	st8 [temp1]=r12		// os_status, default is cold boot

	mov r6=IA64_MCA_SAME_CONTEXT

	;;
@@ -820,8 +824,8 @@ ia64_state_restore: 
	// Restore the SAL to OS state. The previous code left regs at pt_regs.

	add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs

	;;

	add temp1=IA64_SAL_OS_STATE_COMMON_OFFSET, regs

	add temp2=IA64_SAL_OS_STATE_COMMON_OFFSET+8, regs

	add temp1=SOS(SAL_RA), regs

	add temp2=SOS(SAL_GP), regs

	;;

	ld8 r12=[temp1],16	// sal_ra

	ld8 r9=[temp2],16	// sal_gp
@@ -842,8 +846,10 @@ ia64_state_restore: 
	;;

	mov cr.itir=temp3

	mov cr.iipa=temp4

	ld8 temp3=[temp1],16	// cr.iim

	ld8 temp4=[temp2],16	// cr.iha

	ld8 temp3=[temp1]	// cr.iim

	ld8 temp4=[temp2]		// cr.iha

	add temp1=SOS(OS_STATUS), regs

	add temp2=SOS(CONTEXT), regs

	;;

	mov cr.iim=temp3

	mov cr.iha=temp4
@@ -916,7 +922,7 @@ ia64_state_restore: 


ia64_new_stack:

	add regs=MCA_PT_REGS_OFFSET, r3

	add temp2=MCA_SOS_OFFSET+IA64_SAL_OS_STATE_PAL_MIN_STATE_OFFSET, r3

	add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3

	mov b0=r2			// save return address

	GET_IA64_MCA_DATA(temp1)

	invala
@@ -1020,7 +1026,7 @@ ia64_old_stack: 


ia64_set_kernel_registers:

	add temp3=MCA_SP_OFFSET, r3

	add temp4=MCA_SOS_OFFSET+IA64_SAL_OS_STATE_OS_GP_OFFSET, r3

	add temp4=MCA_SOS_OFFSET+SOS(OS_GP), r3

	mov b0=r2		// save return address

	GET_IA64_MCA_DATA(temp1)

	;;

include/asm-ia64/mca.h

+6 −3
Original line number Diff line number Diff line
@@ -69,14 +69,16 @@ typedef struct ia64_mc_info_s { 
 */



struct ia64_sal_os_state {

	/* SAL to OS, must be at offset 0 */



	/* SAL to OS */

	u64			os_gp;			/* GP of the os registered with the SAL, physical */

	u64			pal_proc;		/* PAL_PROC entry point, physical */

	u64			sal_proc;		/* SAL_PROC entry point, physical */

	u64			rv_rc;			/* MCA - Rendezvous state, INIT - reason code */

	u64			proc_state_param;	/* from R18 */

	u64			monarch;		/* 1 for a monarch event, 0 for a slave */

	/* common, must follow SAL to OS */



	/* common */

	u64			sal_ra;			/* Return address in SAL, physical */

	u64			sal_gp;			/* GP of the SAL - physical */

	pal_min_state_area_t	*pal_min_state;		/* from R17.  physical in asm, virtual in C */
@@ -98,7 +100,8 @@ struct ia64_sal_os_state { 
	u64			iipa;

	u64			iim;

	u64			iha;

	/* OS to SAL, must follow common */



	/* OS to SAL */

	u64			os_status;		/* OS status to SAL, enum below */

	u64			context;		/* 0 if return to same context

							   1 if return to new context */