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pru: Fix memory corruption on syscall return

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In the initial code I missed one level of pointer indirection. Instead
of storing errno in impure_data, _impure_ptr was corrupted.

Only simulator is impacted. Real targets have no OS and no syscalls.

This resolves a bunch of stdio cases from the GCC testsuite:
  FAIL->PASS: gcc.c-torture/execute/printf-2.c   -O0  execution test

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
This commit is contained in:
Dimitar Dimitrov 2020-06-03 19:14:22 +03:00 committed by Corinna Vinschen
parent 5266248285
commit 70cd4cbe65
1 changed files with 1 additions and 0 deletions
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libgloss/pru/syscalls.S
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@ -42,6 +42,7 @@ __SC_ret:
/* Invert return code and store to errno (first int in _impure_ptr). */
rsb r14, r14, 0
ldi32 r1, _impure_ptr
lbbo r1, r1, 0, 4
sbbo r14, r1, 0, 4
/* Return -1 (for both int32_t or int64_t). */
fill r14, 8