Imagelibrary/rt-thread
1
0
Fork 0
mirror of https://github.com/RT-Thread/rt-thread.git synced 2025-12-26 09:08:25 +00:00
Code Issues Packages Projects Releases Wiki Activity

[libcpu][cortex-a] Refactor FPU stack initialization for maintainability (#10919)

Browse Source 
* Initial plan

* [libcpu][cortex-a] Improve FPU stack initialization implementation

Co-authored-by: BernardXiong <1241087+BernardXiong@users.noreply.github.com>

* [libcpu][cortex-a] Replace FPU init loop with rt_memset

Co-authored-by: BernardXiong <1241087+BernardXiong@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: BernardXiong <1241087+BernardXiong@users.noreply.github.com>
This commit is contained in:
Copilot
2025-11-12 04:34:34 +08:00
committed by GitHub
parent 284081fe4c
commit e525c38cb8
2 changed files with 12 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
libcpu/arm/cortex-a/stack.c
View File

@@ -61,7 +61,13 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
*(--stk) = 0; /* user sp*/
#endif
#ifdef RT_USING_FPU
*(--stk) = 0; /* not use fpu*/
/* FPU context initialization matches context_gcc.S restore order:
* Stack layout (high to low): FPEXC -> FPSCR -> D16-D31 -> D0-D15
*/
stk -= VFP_DATA_NR;
rt_memset(stk, 0, VFP_DATA_NR * sizeof(rt_uint32_t)); /* Initialize D0-D31 (64 words for 32 double regs) */
*(--stk) = 0; /* FPSCR: Floating-Point Status and Control Register */
*(--stk) = 0x40000000; /* FPEXC: Enable FPU (bit 30 = EN) */
#endif
/* return task's current stack address */