diff options
Diffstat (limited to 'libs/context/src/asm/fcontext_arm_aapcs_elf_gas.S')
| -rw-r--r-- | libs/context/src/asm/fcontext_arm_aapcs_elf_gas.S | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/libs/context/src/asm/fcontext_arm_aapcs_elf_gas.S b/libs/context/src/asm/fcontext_arm_aapcs_elf_gas.S new file mode 100644 index 0000000000..7724441c5b --- /dev/null +++ b/libs/context/src/asm/fcontext_arm_aapcs_elf_gas.S @@ -0,0 +1,101 @@ +/* + Copyright Oliver Kowalke 2009. + Distributed under the Boost Software License, Version 1.0. + (See accompanying file LICENSE_1_0.txt or copy at + http://www.boost.org/LICENSE_1_0.txt) +*/ + +/******************************************************************* + * * + * ------------------------------------------------------------- * + * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | * + * ------------------------------------------------------------- * + * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| 0x20| 0x24| * + * ------------------------------------------------------------- * + * | v1 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | sp | lr | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 10 | | * + * ------------------------------------------------------------- * + * | 0x28| | * + * ------------------------------------------------------------- * + * | pc | | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 11 | 12 | | * + * ------------------------------------------------------------- * + * | 0x2c| 0x30| | * + * ------------------------------------------------------------- * + * |sbase|slimit| | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | * + * ------------------------------------------------------------- * + * | 0x34| 0x38|0x3c| 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58 | * + * ------------------------------------------------------------- * + * | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | s24 | s25 | * + * ------------------------------------------------------------- * + * ------------------------------------------------------------- * + * | 23 | 24 | 25 | 26 | 27 | 28 | | * + * ------------------------------------------------------------- * + * | 0x5c| 0x60| 0x64| 0x68| 0x6c| 0x70| | * + * ------------------------------------------------------------- * + * | s26 | s27 | s28 | s29 | s30 | s31 | | * + * ------------------------------------------------------------- * + * * + * *****************************************************************/ + +.text +.globl jump_fcontext +.align 2 +.type jump_fcontext,%function +jump_fcontext: + stmia a1, {v1-v8,sp-lr} @ save V1-V8,SP-LR + str lr, [a1,#40] @ save LR as PC + +#if (defined(__VFP_FP__) && !defined(__SOFTFP__)) + cmp a4, #0 @ test if fpu env should be preserved + beq 1f + + mov a4, a1 + add a4, #52 + fstmiax a4, {d8-d15} @ save S16-S31 + + mov a4, a2 + add a4, #52 + fldmiax a4, {d8-d15} @ restore S16-S31 +1: +#endif + + mov a1, a3 @ use third arg as return value after jump + @ and as first arg in context function + ldmia a2, {v1-v8,sp-pc} @ restore v1-V8,SP-PC +.size jump_fcontext,.-jump_fcontext + +.text +.globl make_fcontext +.align 2 +.type make_fcontext,%function +make_fcontext: + str a1, [a1,#0] @ save the address of passed context + str a2, [a1,#40] @ save address of the context function + ldr a2, [a1,#44] @ load the stack base + + push {a1,lr} @ save pointer to fcontext_t + mov a1, a2 @ stack pointer as arg for align_stack + bl align_stack@PLT @ align stack + mov a2, a1 @ begin of aligned stack + pop {a1,lr} @ restore pointer to fcontext_t + + str a2, [a1,#32] @ save the aligned stack base + + adr a2, finish @ address of finish; called after context function returns + str a2, [a1,#36] + + mov a1, #0 + bx lr + +finish: + mov a1, #0 @ exit code is zero + bl _exit@PLT @ exit application +.size make_fcontext,.-make_fcontext |