From 8ef8fed56e1b8a9c0d5068c3c42bc5036aecf9cb Mon Sep 17 00:00:00 2001
From: acevest <zhaoyanbai@126.com>
Date: Tue, 24 Sep 2019 10:19:57 +0800
Subject: [PATCH] fix risc-v gp(global pointer register) problem

---
 arch/risc-v/common/tos_cpu.c                         | 4 ++++
 board/GD32VF103C_START/eclipse/hello_world/.cproject | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/risc-v/common/tos_cpu.c b/arch/risc-v/common/tos_cpu.c
index 6edd6079..311396f2 100644
--- a/arch/risc-v/common/tos_cpu.c
+++ b/arch/risc-v/common/tos_cpu.c
@@ -99,6 +99,10 @@ __KERNEL__ k_stack_t *cpu_task_stk_init(void *entry,
         #undef _V
     }
 
+    cpu_data_t gp;
+    asm("mv %0, gp"::"r"(gp));
+
+    regs->gp        = (cpu_data_t)gp;                           // gp: global pointer
     regs->a0        = (cpu_data_t)arg;                          // a0: argument
     regs->ra        = (cpu_data_t)0xACE00ACE;                   // ra: return address
     regs->mstatus   = (cpu_data_t)(MSTATUS_MPP | MSTATUS_MPIE); // return to machine mode and enable interrupt
diff --git a/board/GD32VF103C_START/eclipse/hello_world/.cproject b/board/GD32VF103C_START/eclipse/hello_world/.cproject
index 10165b10..c4535ca2 100644
--- a/board/GD32VF103C_START/eclipse/hello_world/.cproject
+++ b/board/GD32VF103C_START/eclipse/hello_world/.cproject
@@ -175,7 +175,7 @@
                                 								
                                 <option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.usenewlibnosys.584568698" name="Do not use syscalls (--specs=nosys.specs)" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.usenewlibnosys" useByScannerDiscovery="false" value="true" valueType="boolean"/>
                                 								
-                                <option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.other.328577347" name="Other linker flags" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.other" useByScannerDiscovery="false" value="-W -mno-relax" valueType="string"/>
+                                <option id="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.other.328577347" name="Other linker flags" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.option.c.linker.other" useByScannerDiscovery="false" value="" valueType="string"/>
                                 								
                                 <inputType id="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.c.linker.input.316705344" superClass="ilg.gnumcueclipse.managedbuild.cross.riscv.tool.c.linker.input">