http://www.boost.org/LICENSE_1_0.txt)
*/
-/******************************************************
+/*******************************************************
* *
* ------------------------------------------------- *
- * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
- * ------------------------------------------------- *
* | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
* ------------------------------------------------- *
- * | F14 | F15 | F16 | F17 | *
- * ------------------------------------------------- *
+ * |bchai|hiddn| fpscr | PC | CR | R14 | R15 | *
* ------------------------------------------------- *
- * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | *
* ------------------------------------------------- *
- * | F18 | F19 | F20 | F21 | *
+ * | R16 | R17 | R18 | R19 | R20 | R21 | R22 | R23 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
- * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
- * ------------------------------------------------- *
* | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | *
* ------------------------------------------------- *
- * | F22 | F23 | F24 | F25 | *
- * ------------------------------------------------- *
+ * | R24 | R25 | R26 | R27 | R28 | R29 | R30 | R31 | *
* ------------------------------------------------- *
- * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
* ------------------------------------------------- *
* | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | *
* ------------------------------------------------- *
- * | F26 | F27 | F28 | F29 | *
- * ------------------------------------------------- *
+ * | F14 | F15 | F16 | F17 | *
* ------------------------------------------------- *
- * | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
* ------------------------------------------------- *
* | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | *
* ------------------------------------------------- *
- * | F30 | F31 | fpscr | R13 | R14 | *
- * ------------------------------------------------- *
+ * | F18 | F19 | F20 | F21 | *
* ------------------------------------------------- *
- * | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | *
* ------------------------------------------------- *
* | 160 | 164 | 168 | 172 | 176 | 180 | 184 | 188 | *
* ------------------------------------------------- *
- * | R15 | R16 | R17 | R18 | R19 | R20 | R21 | R22 | *
- * ------------------------------------------------- *
+ * | F22 | F23 | F24 | F25 | *
* ------------------------------------------------- *
- * | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | *
* ------------------------------------------------- *
* | 192 | 196 | 200 | 204 | 208 | 212 | 216 | 220 | *
* ------------------------------------------------- *
- * | R23 | R24 | R25 | R26 | R27 | R28 | R29 | R30 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | *
- * ------------------------------------------------- *
- * | 224 | 228 | 232 | 236 | 240 | 244 | 248 | 252 | *
- * ------------------------------------------------- *
- * | R31 |hiddn| CR | LR | PC |bchai|linkr| FCTX| *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 64 | | *
- * ------------------------------------------------- *
- * | 256 | | *
- * ------------------------------------------------- *
- * | DATA| | *
+ * | F26 | F27 | F28 | F29 | *
* ------------------------------------------------- *
+ * ------------------------|------------ *
+ * | 224 | 228 | 232 | 236 | 240 | 244 | *
+ * ------------------------|------------ *
+ * | F30 | F31 |bchai| LR | *
+ * ------------------------|------------ *
* *
*******************************************************/
+.file "make_ppc32_sysv_elf_gas.S"
.text
.globl make_fcontext
.align 2
# shift address in R3 to lower 16 byte boundary
clrrwi %r3, %r3, 4
- # reserve space for context-data on context-stack
- # including 64 byte of linkage + parameter area (R1 % 16 == 0)
- subi %r3, %r3, 336
+ # reserve space on context-stack, including 16 bytes of linkage
+ # and parameter area + 240 bytes of context-data (R1 % 16 == 0)
+ subi %r3, %r3, 16 + 240
# third arg of make_fcontext() == address of context-function
- stw %r5, 240(%r3)
+#ifdef __linux__
+ # save context-function as PC
+ stw %r5, 16(%r3)
+#else
+ # save context-function for trampoline
+ stw %r5, 248(%r3)
+#endif
# set back-chain to zero
li %r0, 0
- stw %r0, 244(%r3)
+ stw %r0, 240(%r3)
- mffs %f0 # load FPSCR
- stfd %f0, 144(%r3) # save FPSCR
+ # copy FPSCR to new context
+ mffs %f0
+ stfd %f0, 8(%r3)
- # compute address of returned transfer_t
- addi %r0, %r3, 252
- mr %r4, %r0
- stw %r4, 228(%r3)
+#ifdef __linux__
+ # set hidden pointer for returning transfer_t
+ la %r0, 248(%r3)
+ stw %r0, 4(%r3)
+#endif
- # load LR
- mflr %r0
- # jump to label 1
+ # load address of label 1 into R4
bl 1f
-1:
- # load LR into R4
- mflr %r4
+1: mflr %r4
+#ifndef __linux__
+ # compute abs address of trampoline, use as PC
+ addi %r7, %r4, trampoline - 1b
+ stw %r7, 16(%r3)
+#endif
# compute abs address of label finish
addi %r4, %r4, finish - 1b
- # restore LR
- mtlr %r0
# save address of finish as return-address for context-function
# will be entered after context-function returns
- stw %r4, 236(%r3)
+ stw %r4, 244(%r3)
# restore return address from R6
mtlr %r6
blr # return pointer to context-data
+#ifndef __linux__
+trampoline:
+ # On systems other than Linux, jump_fcontext is returning the
+ # transfer_t in R3:R4, but we need to pass transfer_t * R3 to
+ # our context-function.
+ lwz %r0, 8(%r1) # address of context-function
+ mtctr %r0
+ stw %r3, 8(%r1)
+ stw %r4, 12(%r1)
+ la %r3, 8(%r1) # address of transfer_t
+ bctr
+#endif
+
finish:
- # save return address into R0
- mflr %r0
- # save return address on stack, set up stack frame
- stw %r0, 4(%r1)
- # allocate stack space, R1 % 16 == 0
- stwu %r1, -16(%r1)
-
- # exit code is zero
+ # Use the secure PLT for _exit(0). If we use the insecure BSS PLT
+ # here, then the linker may use the insecure BSS PLT even if the
+ # C++ compiler wanted the secure PLT.
+
+ # set R30 for secure PLT, large model
+ bl 2f
+2: mflr %r30
+ addis %r30, %r30, .Ltoc - 2b@ha
+ addi %r30, %r30, .Ltoc - 2b@l
+
+ # call _exit(0) with special addend 0x8000 for large model
li %r3, 0
- # exit application
- bl _exit@plt
+ bl _exit + 0x8000@plt
.size make_fcontext, .-make_fcontext
+/* Provide the GOT pointer for secure PLT, large model. */
+.section .got2,"aw"
+.Ltoc = . + 0x8000
+
/* Mark that we don't need executable stack. */
.section .note.GNU-stack,"",%progbits
projects / ceph.git / blobdiff