cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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callback_srm.S (2999B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 *	arch/alpha/lib/callback_srm.S
      4 */
      5
      6#include <asm/console.h>
      7#include <asm/export.h>
      8
      9.text
     10#define HWRPB_CRB_OFFSET 0xc0
     11
     12#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
     13.align 4
     14srm_dispatch:
     15#if defined(CONFIG_ALPHA_GENERIC)
     16	ldl	$4,alpha_using_srm
     17	beq	$4,nosrm
     18#endif
     19	ldq	$0,hwrpb	# gp is set up by CALLBACK macro.
     20	ldl	$25,0($25)	# Pick up the wrapper data.
     21	mov	$20,$21		# Shift arguments right.
     22	mov	$19,$20
     23	ldq	$1,HWRPB_CRB_OFFSET($0)
     24	mov	$18,$19
     25	mov	$17,$18
     26	mov	$16,$17
     27	addq	$0,$1,$2	# CRB address
     28	ldq	$27,0($2)	# DISPATCH procedure descriptor (VMS call std)
     29	extwl	$25,0,$16	# SRM callback function code
     30	ldq	$3,8($27)	# call address
     31	extwl	$25,2,$25	# argument information (VMS calling std)
     32	jmp	($3)		# Return directly to caller of wrapper.
     33
     34.align 4
     35.globl	srm_fixup
     36.ent	srm_fixup
     37srm_fixup:
     38	ldgp	$29,0($27)
     39#if defined(CONFIG_ALPHA_GENERIC)
     40	ldl	$4,alpha_using_srm
     41	beq	$4,nosrm
     42#endif
     43	ldq	$0,hwrpb
     44	ldq	$1,HWRPB_CRB_OFFSET($0)
     45	addq	$0,$1,$2	# CRB address
     46	ldq	$27,16($2)	# VA of FIXUP procedure descriptor
     47	ldq	$3,8($27)	# call address
     48	lda	$25,2($31)	# two integer arguments
     49	jmp	($3)		# Return directly to caller of srm_fixup.
     50.end    srm_fixup
     51
     52#if defined(CONFIG_ALPHA_GENERIC)
     53.align 3
     54nosrm:
     55	lda	$0,-1($31)
     56	ret
     57#endif
     58
     59#define CALLBACK(NAME, CODE, ARG_CNT) \
     60.align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
     61ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME
     62
     63#else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
     64
     65#define CALLBACK(NAME, CODE, ARG_CNT) \
     66.align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
     67lda $0,-1($31); ret; .end callback_##NAME
     68
     69.align 3
     70.globl	srm_fixup
     71.ent	srm_fixup
     72srm_fixup:
     73	lda	$0,-1($31)
     74	ret
     75.end	srm_fixup
     76#endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
     77
     78CALLBACK(puts, CCB_PUTS, 4)
     79CALLBACK(open, CCB_OPEN, 3)
     80CALLBACK(close, CCB_CLOSE, 2)
     81CALLBACK(read, CCB_READ, 5)
     82CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
     83CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
     84CALLBACK(getenv, CCB_GET_ENV, 4)
     85CALLBACK(setenv, CCB_SET_ENV, 4)
     86CALLBACK(getc, CCB_GETC, 2)
     87CALLBACK(reset_term, CCB_RESET_TERM, 2)
     88CALLBACK(term_int, CCB_SET_TERM_INT, 3)
     89CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
     90CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
     91CALLBACK(ioctl, CCB_IOCTL, 6)
     92CALLBACK(write, CCB_WRITE, 5)
     93CALLBACK(reset_env, CCB_RESET_ENV, 4)
     94CALLBACK(save_env, CCB_SAVE_ENV, 1)
     95CALLBACK(pswitch, CCB_PSWITCH, 3)
     96CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
     97
     98EXPORT_SYMBOL(callback_getenv)
     99EXPORT_SYMBOL(callback_setenv)
    100EXPORT_SYMBOL(callback_save_env)
    101	
    102.data
    103__alpha_using_srm:		# For use by bootpheader
    104	.long 7			# value is not 1 for link debugging
    105	.weak alpha_using_srm; alpha_using_srm = __alpha_using_srm
    106__callback_init_done:		# For use by bootpheader
    107	.long 7			# value is not 1 for link debugging
    108	.weak callback_init_done; callback_init_done = __callback_init_done
    109