[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v3 37/40] mips_malta: Fix semihosting argument passi
From: |
Stefan Markovic |
Subject: |
[Qemu-devel] [PATCH v3 37/40] mips_malta: Fix semihosting argument passing for nanoMIPS bare metal |
Date: |
Thu, 19 Jul 2018 14:55:09 +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
- Re: [Qemu-devel] [PATCH v3 14/40] target/mips: Add emulation of misc nanoMIPS instructions (pool32axf), (continued)
- [Qemu-devel] [PATCH v3 38/40] gdbstub: Disable handling of nanoMIPS ISA bit in the MIPS gdbstub, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 34/40] linux-user: Don't check FCR31_NAN2008 bit for nanoMIPS, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 25/40] target/mips: Add updating CP0 BadInstrX register for nanoMIPs only, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 35/40] mips_malta: Add basic nanoMIPS boot code for MIPS' Malta, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 27/40] target/mips: Adjust behavior of Config3's ISAOnExc bit for nanoMIPS, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 37/40] mips_malta: Fix semihosting argument passing for nanoMIPS bare metal,
Stefan Markovic <=
- [Qemu-devel] [PATCH v3 32/40] elf: Add nanoMIPS specific variations in ELF header fields, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 02/40] target/mips: Add nanoMIPS base instruction set opcodes, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 26/40] target/mips: Implement CP0 Config0.WR bit functionality, Stefan Markovic, 2018/07/19
- [Qemu-devel] [PATCH v3 23/40] target/mips: Implement emulation of nanoMIPS LLWP/SCWP pair, Stefan Markovic, 2018/07/19