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.  */
41 	.long 0,0,0
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.  */
47   .byte 0x0f;			/* DW_CFA_def_cfa_expression */		\
48   .uleb128 9f - 1f;		/*   length */				\
50   .byte 0x71; .sleb128 PTREGS;	/*     DW_OP_breg1 */			\
51   .byte 0x06;			/*     DW_OP_deref */			\
52   .byte 0x23; .uleb128 RSIZE;	/*     DW_OP_plus_uconst */		\
53   .byte 0x06;			/*     DW_OP_deref */			\
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.  */
59   .byte 0x10;			/* DW_CFA_expression */			\
61   .uleb128 9f - 1f;		/*   length */				\
63   .byte 0x71; .sleb128 PTREGS;	/*     DW_OP_breg1 */			\
64   .byte 0x06;			/*     DW_OP_deref */			\
66     .byte 0x23; .uleb128 ofs;	/*     DW_OP_plus_uconst */		\
68 9:
71    of the VMX reg struct.  A pointer to the VMX reg struct is at VREGS in
72    the pt_regs struct.  This macro is for REGNO == 0, and contains
75   .byte 0x10;			/* DW_CFA_expression */			\
77   .uleb128 9f - 1f;		/*   length */				\
79   .byte 0x30 + regno;		/*     DW_OP_lit0 */			\
81   .byte 0x40;			/*     DW_OP_lit16 */			\
82   .byte 0x1e;			/*     DW_OP_mul */			\
84   .byte 0x71; .sleb128 PTREGS;	/*     DW_OP_breg1 */			\
85   .byte 0x06;			/*     DW_OP_deref */			\
86   .byte 0x12;			/*     DW_OP_dup */			\
87   .byte 0x23;			/*     DW_OP_plus_uconst */		\
89   .byte 0x06;			/*     DW_OP_deref */			\
90   .byte 0x0c; .long 1 << 25;	/*     DW_OP_const4u */			\
91   .byte 0x1a;			/*     DW_OP_and */			\
92   .byte 0x12;			/*     DW_OP_dup, ret 0 if bra taken */	\
93   .byte 0x30;			/*     DW_OP_lit0 */			\
94   .byte 0x29;			/*     DW_OP_eq */			\
95   .byte 0x28; .short 0x7fff;	/*     DW_OP_bra to end */		\
96   .byte 0x13;			/*     DW_OP_drop, pop the 0 */		\
97   .byte 0x23; .uleb128 VREGS;	/*     DW_OP_plus_uconst */		\
98   .byte 0x06;			/*     DW_OP_deref */			\
99   .byte 0x22;			/*     DW_OP_plus */			\
100   .byte 0x2f; .short 0x7fff;	/*     DW_OP_skip to end */		\
101 9:
106   .byte 0x10;			/* DW_CFA_expression */			\
108   .uleb128 9f - 1f;		/*   length */				\
110   .byte 0x30 + regno;		/*     DW_OP_lit n */			\
111   .byte 0x2f; .short 2b - 9f;	/*     DW_OP_skip */			\
112 9:
117   .byte 0x10;			/* DW_CFA_expression */			\
119   .uleb128 9f - 1f;		/*   length */				\
121   .byte 0x0a; .short ofs;	/*     DW_OP_const2u */			\
122   .byte 0x2f; .short 3b - 9f;	/*     DW_OP_skip */			\
123 9:
127   .byte 0x10;			/* DW_CFA_expression */			\
129   .uleb128 9f - 1f;		/*   length */				\
131   .byte 0x71; .sleb128 PTREGS;	/*     DW_OP_breg1 */			\
132   .byte 0x06;			/*     DW_OP_deref */			\
133   .byte 0x23; .uleb128 VREGS;	/*     DW_OP_plus_uconst */		\
134   .byte 0x06;			/*     DW_OP_deref */			\
135   .byte 0x23; .uleb128 ofs;	/*     DW_OP_plus_uconst */		\
136 9:
147 /* Offset of CR reg within a full word. */
149 #define CROFF 0
151 #define CROFF (RSIZE - CRSIZE)
160   rsave ( 0,  0*RSIZE);							\
168   rsave ( 9,  9*RSIZE);							\
204   rsave (32, 48*RSIZE +  0*8);						\
213   rsave (41, 48*RSIZE +  9*8);						\
240   vsave_msr0 ( 0);							\
249   vsave_msr1 ( 9);							\
278 	.section .eh_frame,"a",@progbits
280 	.long .Lcie_end - .Lcie_start
282 	.long 0			/* CIE ID */
284 	.string "zRS"		/* NUL-terminated augmentation string */
286 	.sleb128 -8		/* Data alignment factor */
289 	.byte 0x14		/* DW_EH_PE_pcrel | DW_EH_PE_udata8. */
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
299 	.uleb128 0			/* Augmentation */
306 #	.byte 0x41		/* DW_CFA_advance_loc 1*4 */