1 /* Jump to a new context powerpc32 common.
2 Copyright (C) 2005, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
20 /* This is the common implementation of setcontext for powerpc32.
21 It not complete in itself should be included in to a framework that
27 Any archecture that implements the Vector unit is assumed to also
28 implement the floating unit. */
30 /* Stack frame offsets. */
31 #define _FRAME_BACKCHAIN 0
32 #define _FRAME_LR_SAVE 4
33 #define _FRAME_PARM_SAVE1 8
34 #define _FRAME_PARM_SAVE2 12
35 #define _FRAME_PARM_SAVE3 16
36 #define _FRAME_PARM_SAVE4 20
38 #ifdef __CONTEXT_ENABLE_VRS
41 ENTRY(__CONTEXT_FUNC_NAME)
44 cfi_adjust_cfa_offset (16)
46 cfi_offset (lr, _FRAME_LR_SAVE)
49 lwz r31,_UC_REGS_PTR(r3)
52 * If this ucontext refers to the point where we were interrupted
53 * by a signal, we have to use the rt_sigreturn system call to
54 * return to the context so we get both LR and CTR restored.
56 * Otherwise, the context we are restoring is either just after
57 * a procedure call (getcontext/swapcontext) or at the beginning
58 * of a procedure call (makecontext), so we don't need to restore
59 * r0, xer, ctr. We don't restore r2 since it will be used as
62 lwz r0,_UC_GREGS+(PT_MSR*4)(r31)
64 bne 4f /* L(do_sigret) */
66 /* Restore the signal mask */
68 addi r4,r3,_UC_SIGMASK
70 bl __sigprocmask@local
72 bne 3f /* L(error_exit) */
74 #ifdef __CONTEXT_ENABLE_FPRS
75 # ifdef __CONTEXT_ENABLE_VRS
78 # ifdef HAVE_ASM_PPC_REL16
81 addis r7,r7,_GLOBAL_OFFSET_TABLE_-1b@ha
82 addi r7,r7,_GLOBAL_OFFSET_TABLE_-1b@l
84 bl _GLOBAL_OFFSET_TABLE_@local-4
88 lwz r7,_rtld_global_ro@got(r7)
90 lwz r7,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r7)
92 lwz r7,_dl_hwcap@got(r7)
98 lwz r7,_dl_hwcap@l(r7)
100 andis. r7,r7,(PPC_FEATURE_HAS_ALTIVEC >> 16)
101 la r10,(_UC_VREGS)(r31)
102 beq 2f /* L(has_no_vec) */
108 beq 2f /* L(has_no_vec) */
197 2: /* L(has_no_vec): */
198 # endif /* __CONTEXT_ENABLE_VRS */
199 /* Restore the floating-point registers */
200 lfd fp31,_UC_FREGS+(32*8)(r31)
201 lfd fp0,_UC_FREGS+(0*8)(r31)
203 lfd fp1,_UC_FREGS+(1*8)(r31)
204 lfd fp2,_UC_FREGS+(2*8)(r31)
205 lfd fp3,_UC_FREGS+(3*8)(r31)
206 lfd fp4,_UC_FREGS+(4*8)(r31)
207 lfd fp5,_UC_FREGS+(5*8)(r31)
208 lfd fp6,_UC_FREGS+(6*8)(r31)
209 lfd fp7,_UC_FREGS+(7*8)(r31)
210 lfd fp8,_UC_FREGS+(8*8)(r31)
211 lfd fp9,_UC_FREGS+(9*8)(r31)
212 lfd fp10,_UC_FREGS+(10*8)(r31)
213 lfd fp11,_UC_FREGS+(11*8)(r31)
214 lfd fp12,_UC_FREGS+(12*8)(r31)
215 lfd fp13,_UC_FREGS+(13*8)(r31)
216 lfd fp14,_UC_FREGS+(14*8)(r31)
217 lfd fp15,_UC_FREGS+(15*8)(r31)
218 lfd fp16,_UC_FREGS+(16*8)(r31)
219 lfd fp17,_UC_FREGS+(17*8)(r31)
220 lfd fp18,_UC_FREGS+(18*8)(r31)
221 lfd fp19,_UC_FREGS+(19*8)(r31)
222 lfd fp20,_UC_FREGS+(20*8)(r31)
223 lfd fp21,_UC_FREGS+(21*8)(r31)
224 lfd fp22,_UC_FREGS+(22*8)(r31)
225 lfd fp23,_UC_FREGS+(23*8)(r31)
226 lfd fp24,_UC_FREGS+(24*8)(r31)
227 lfd fp25,_UC_FREGS+(25*8)(r31)
228 lfd fp26,_UC_FREGS+(26*8)(r31)
229 lfd fp27,_UC_FREGS+(27*8)(r31)
230 lfd fp28,_UC_FREGS+(28*8)(r31)
231 lfd fp29,_UC_FREGS+(29*8)(r31)
232 lfd fp30,_UC_FREGS+(30*8)(r31)
233 lfd fp31,_UC_FREGS+(31*8)(r31)
234 #endif /* __CONTEXT_ENABLE_FPRS */
236 /* Restore LR and CCR, and set CTR to the NIP value */
237 lwz r3,_UC_GREGS+(PT_LNK*4)(r31)
238 lwz r4,_UC_GREGS+(PT_NIP*4)(r31)
239 lwz r5,_UC_GREGS+(PT_CCR*4)(r31)
244 /* Restore the general registers */
245 lwz r1,_UC_GREGS+(PT_R1*4)(r31)
246 lwz r3,_UC_GREGS+(PT_R3*4)(r31)
247 lwz r4,_UC_GREGS+(PT_R4*4)(r31)
248 lwz r5,_UC_GREGS+(PT_R5*4)(r31)
249 lwz r6,_UC_GREGS+(PT_R6*4)(r31)
250 lwz r7,_UC_GREGS+(PT_R7*4)(r31)
251 lwz r8,_UC_GREGS+(PT_R8*4)(r31)
252 lwz r9,_UC_GREGS+(PT_R9*4)(r31)
253 lwz r10,_UC_GREGS+(PT_R10*4)(r31)
254 lwz r11,_UC_GREGS+(PT_R11*4)(r31)
255 lwz r12,_UC_GREGS+(PT_R12*4)(r31)
256 lwz r13,_UC_GREGS+(PT_R13*4)(r31)
257 lwz r14,_UC_GREGS+(PT_R14*4)(r31)
258 lwz r15,_UC_GREGS+(PT_R15*4)(r31)
259 lwz r16,_UC_GREGS+(PT_R16*4)(r31)
260 lwz r17,_UC_GREGS+(PT_R17*4)(r31)
261 lwz r18,_UC_GREGS+(PT_R18*4)(r31)
262 lwz r19,_UC_GREGS+(PT_R19*4)(r31)
263 lwz r20,_UC_GREGS+(PT_R20*4)(r31)
264 lwz r21,_UC_GREGS+(PT_R21*4)(r31)
265 lwz r22,_UC_GREGS+(PT_R22*4)(r31)
266 lwz r23,_UC_GREGS+(PT_R23*4)(r31)
267 lwz r24,_UC_GREGS+(PT_R24*4)(r31)
268 lwz r25,_UC_GREGS+(PT_R25*4)(r31)
269 lwz r26,_UC_GREGS+(PT_R26*4)(r31)
270 lwz r27,_UC_GREGS+(PT_R27*4)(r31)
271 lwz r28,_UC_GREGS+(PT_R28*4)(r31)
272 lwz r29,_UC_GREGS+(PT_R29*4)(r31)
273 lwz r30,_UC_GREGS+(PT_R30*4)(r31)
274 lwz r31,_UC_GREGS+(PT_R31*4)(r31)
278 3: /* L(error_exit): */
286 4: /* L(do_sigret): */
288 li r0,SYS_ify(rt_sigreturn)
292 END (__CONTEXT_FUNC_NAME)