kernel/vdso/sigtramp64.S

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3  * Signal trampoline for 64 bits processes in a ppc64 kernel for
39    chosen in such a way that older libgcc unwind code returns a zero
40    for a sigcontext pointer.  */
42 	.quad 0,-21*8
44 /* Register r1 can be found at offset 8 of a pt_regs structure.
45    A pointer to the pt_regs is stored in memory at the old sp plus PTREGS.  */
48   .uleb128 9f - 1f;		/*   length */				\
49 1:									\
54 9:
56 /* Register REGNO can be found at offset OFS of a pt_regs structure.
57    A pointer to the pt_regs is stored in memory at the old sp plus PTREGS.  */
61   .uleb128 9f - 1f;		/*   length */				\
62 1:									\
68 9:
70 /* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16
71    of the VMX reg struct.  A pointer to the VMX reg struct is at VREGS in
77   .uleb128 9f - 1f;		/*   length */				\
78 1:									\
90   .byte 0x0c; .long 1 << 25;	/*     DW_OP_const4u */			\
101 9:
103 /* If msr bit 1<<25 is set, then VMX register REGNO is at offset REGNO*16
104    of the VMX reg struct.  REGNO is 1 thru 31.  */
108   .uleb128 9f - 1f;		/*   length */				\
109 1:									\
111   .byte 0x2f; .short 2b - 9f;	/*     DW_OP_skip */			\
112 9:
114 /* If msr bit 1<<25 is set, then VMX register REGNO is at offset OFS of
119   .uleb128 9f - 1f;		/*   length */				\
120 1:									\
122   .byte 0x2f; .short 3b - 9f;	/*     DW_OP_skip */			\
123 9:
129   .uleb128 9f - 1f;		/*   length */				\
130 1:									\
136 9:
147 /* Offset of CR reg within a full word. */
151 #define CROFF (RSIZE - CRSIZE)
168   rsave ( 9,  9*RSIZE);							\
205   rsave (33, 48*RSIZE +  1*8);						\
213   rsave (41, 48*RSIZE +  9*8);						\
241   vsave_msr1 ( 1);							\
249   vsave_msr1 ( 9);							\
278 	.section .eh_frame,"a",@progbits
280 	.long .Lcie_end - .Lcie_start
283 	.byte 1			/* Version number */
284 	.string "zRS"		/* NUL-terminated augmentation string */
286 	.sleb128 -8		/* Data alignment factor */
288 	.uleb128 1		/* Augmentation value length */
290 	.byte 0x0c,1,0		/* DW_CFA_def_cfa: r1 ofs 0 */
294 	.long .Lfde0_end - .Lfde0_start
296 	.long .Lfde0_start - .Lcie	/* CIE pointer. */
297 	.quad .Lsigrt_start - .		/* PC start, length */
298 	.quad .Lsigrt_end - .Lsigrt_start
306 #	.byte 0x41		/* DW_CFA_advance_loc 1*4 */