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[Qemu-devel] [PATCH v2 30/33] mips_malta: Fix semihosting argument passi
From: |
Aleksandar Markovic |
Subject: |
[Qemu-devel] [PATCH v2 30/33] mips_malta: Fix semihosting argument passing for nanoMIPS bare metal |
Date: |
Mon, 9 Jul 2018 22:50:28 +0200 |
From: Stefan Markovic <address@hidden>
Signed-off-by: Yongbok Kim <address@hidden>
Signed-off-by: Aleksandar Markovic <address@hidden>
Signed-off-by: Stefan Markovic <address@hidden>
---
hw/mips/mips_malta.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index d1a7c1f..8bb1686 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -643,7 +643,12 @@ static void write_bootloader_nanomips(uint8_t *base,
int64_t run_addr,
stw_p(p++, 0x8000); stw_p(p++, 0xc000); /* nop */
/* to_here: */
- stw_p(p++, 0x0080); stw_p(p++, 0x0002); /* li a0,2 */
+ if (semihosting_get_argc()) {
+ /* Preserve a0 content as arguments have been passed */
+ stw_p(p++, 0x8000); stw_p(p++, 0xc000); /* nop */
+ } else {
+ stw_p(p++, 0x0080); stw_p(p++, 0x0002); /* li a0,2 */
+ }
stw_p(p++, 0xe3a0 | NM_HI1(ENVP_ADDR - 64));
stw_p(p++, NM_HI2(ENVP_ADDR - 64));
/* lui sp,%hi(ENVP_ADDR - 64) */
--
2.7.4
- [Qemu-devel] [PATCH v2 25/33] target/mips: Adjust set_pc() for nanoMIPS, (continued)
- [Qemu-devel] [PATCH v2 25/33] target/mips: Adjust set_pc() for nanoMIPS, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 26/33] target/mips: Fix ERET/ERETNC behavior related to ADEL exception, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 27/33] target/mips: Add ELF flags for MIPS machine variants, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 28/33] mips_malta: Add basic nanoMIPS boot code for MIPS' Malta, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 29/33] mips_malta: Setup GT64120 BARs in nanoMIPS bootloader, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 30/33] mips_malta: Fix semihosting argument passing for nanoMIPS bare metal,
Aleksandar Markovic <=
- [Qemu-devel] [PATCH v2 31/33] gdbstub: Disable handling of nanoMIPS ISA bit in the MIPS gdbstub, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 32/33] gdbstub: Add XML support for GDB for nanoMIPS, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 33/33] target/mips: Add definition of nanoMIPS I7200 CPU, Aleksandar Markovic, 2018/07/09