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py/nlrthumb: Save and restore VFP registers s16-s21 when CPU has them.

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These s16-s21 registers are used by gcc so need to be saved.  Future
versions of gcc (beyond v9.1.0), or other compilers, may eventually need
additional registers saved/restored.

See issue #4844.
This commit is contained in:
Damien George
2019-06-17 23:19:34 +10:00
parent 3ee3995be1
commit 34c04d2319
2 changed files with 18 additions and 1 deletions
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9
py/nlr.h
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@@ -54,7 +54,14 @@
#endif
#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
#define MICROPY_NLR_THUMB (1)
#define MICROPY_NLR_NUM_REGS (10)
#if defined(__SOFTFP__)
#define MICROPY_NLR_NUM_REGS (10)
#else
// With hardware FP registers s16-s31 are callee save so in principle
// should be saved and restored by the NLR code. gcc only uses s16-s21
// so only save/restore those as an optimisation.
#define MICROPY_NLR_NUM_REGS (10 + 6)
#endif
#elif defined(__xtensa__)
#define MICROPY_NLR_XTENSA (1)
#define MICROPY_NLR_NUM_REGS (10)