From: Dimitar Dimitrov <dimitar@dinux.eu>
To: newlib@sourceware.org
Cc: Dimitar Dimitrov <dimitar@dinux.eu>
Subject: [PATCH 2/2] libgloss: pru: Trim crt0-minrt.o
Date: Tue, 2 Jan 2024 10:24:32 +0200 [thread overview]
Message-ID: <20240102082432.1304654-2-dimitar@dinux.eu> (raw)
In-Reply-To: <20240102082432.1304654-1-dimitar@dinux.eu>
Strip a few more instructions from crt0-minrt.S:
- Remove "halt" and rely on the infinite loop after main()'s return.
- Remove main()'s argc and argv argument initialization. Host loader
does not set them, and typical firmware does not use them, either.
- Remove the __dso_handle symbol.
This should be safe because the default crt0.S is fully standards
compliant. Whereas crt0-minrt.S has been documented from the beginning
to intentionally miss features in order to reduce firmware size, while
still enabling typical PRU firmware to operate.
Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
---
libgloss/pru/crt0-minrt.S | 15 +--------------
1 file changed, 1 insertion(+), 14 deletions(-)
diff --git a/libgloss/pru/crt0-minrt.S b/libgloss/pru/crt0-minrt.S
index 60647d372..fa5e80af4 100644
--- a/libgloss/pru/crt0-minrt.S
+++ b/libgloss/pru/crt0-minrt.S
@@ -38,22 +38,9 @@ _start:
/* DATA and BSS are handled by the loader, so nothing to do here. */
- /* Just in case main() tries to access argc, argv[] and envp. */
- zero r14, 3 * 4
-
- /* Call main. */
+ /* Call main. Assume argc and argv are not used with -minrt! */
call main
/* We should never reach here. */
_crt_exit:
- halt
jmp _crt_exit
-
- /* PRU obviously has no shared libraries, but dso_handle
- helps to achieve better GCC test coverage. Besides,
- it should be free with minrt. */
- .section .data
- .global __dso_handle
- .weak __dso_handle
-__dso_handle:
- .long 0
--
2.43.0
next prev parent reply other threads:[~2024-01-02 8:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-02 8:24 [PATCH 1/2] libgloss: merge pru into top-level Makefile Dimitar Dimitrov
2024-01-02 8:24 ` Dimitar Dimitrov [this message]
2024-01-02 13:15 ` Mike Frysinger
2024-01-03 17:56 ` [PATCH v2 " Dimitar Dimitrov
2024-01-03 17:56 ` [PATCH v2 2/2] libgloss: pru: Trim crt0-minrt.o Dimitar Dimitrov
2024-01-03 21:48 ` [PATCH v2 1/2] libgloss: merge pru into top-level Makefile Mike Frysinger
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