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protected build: userspace threads will unexpectly work in privileged mode after syscall

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In protected build mode, the syscall returns without setting correct value for the CONTROL register, which causes the userspace threads working in privileged mode after syscall.

Signed-off-by: pangzhen1 <pangzhen1@xiaomi.com>
This commit is contained in:
pangzhen1
2024-07-30 18:46:35 +08:00
committed by Xiang Xiao
parent d59fbfdbdc
commit dee4c63adb
6 changed files with 9 additions and 0 deletions
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arch/arm/include/armv6-m/irq.h
+1
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@@ -142,6 +142,7 @@ struct xcpt_syscall_s
{
uint32_t excreturn; /* The EXC_RETURN value */
uint32_t sysreturn; /* The return PC */
uint32_t ctrlreturn; /* The return CONTROL value */
};
#endif
arch/arm/include/armv7-m/irq.h
+1
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@@ -202,6 +202,7 @@ struct xcpt_syscall_s
{
uint32_t excreturn; /* The EXC_RETURN value */
uint32_t sysreturn; /* The return PC */
uint32_t ctrlreturn; /* The return CONTROL value */
};
#endif
arch/arm/include/armv8-m/irq.h
+1
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@@ -213,6 +213,7 @@ struct xcpt_syscall_s
{
uint32_t excreturn; /* The EXC_RETURN value */
uint32_t sysreturn; /* The return PC */
uint32_t ctrlreturn; /* The return CONTROL value */
};
#endif
arch/arm/src/armv6-m/arm_svcall.c
+2
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@@ -224,6 +224,7 @@ int arm_svcall(int irq, void *context, void *arg)
regs[REG_PC] = rtcb->xcp.syscall[index].sysreturn;
regs[REG_EXC_RETURN] = rtcb->xcp.syscall[index].excreturn;
regs[REG_CONTROL] = rtcb->xcp.syscall[index].ctrlreturn;
rtcb->xcp.nsyscalls = index;
/* The return value must be in R0-R1. dispatch_syscall()
@@ -417,6 +418,7 @@ int arm_svcall(int irq, void *context, void *arg)
rtcb->xcp.syscall[index].sysreturn = regs[REG_PC];
rtcb->xcp.syscall[index].excreturn = regs[REG_EXC_RETURN];
rtcb->xcp.syscall[index].ctrlreturn = regs[REG_CONTROL];
rtcb->xcp.nsyscalls = index + 1;
regs[REG_PC] = (uint32_t)dispatch_syscall;
arch/arm/src/armv7-m/arm_svcall.c
+2
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@@ -233,6 +233,7 @@ int arm_svcall(int irq, void *context, void *arg)
regs[REG_PC] = rtcb->xcp.syscall[index].sysreturn;
regs[REG_EXC_RETURN] = rtcb->xcp.syscall[index].excreturn;
regs[REG_CONTROL] = rtcb->xcp.syscall[index].ctrlreturn;
rtcb->xcp.nsyscalls = index;
/* The return value must be in R0-R1. dispatch_syscall()
@@ -426,6 +427,7 @@ int arm_svcall(int irq, void *context, void *arg)
rtcb->xcp.syscall[index].sysreturn = regs[REG_PC];
rtcb->xcp.syscall[index].excreturn = regs[REG_EXC_RETURN];
rtcb->xcp.syscall[index].ctrlreturn = regs[REG_CONTROL];
rtcb->xcp.nsyscalls = index + 1;
regs[REG_PC] = (uint32_t)dispatch_syscall & ~1;
arch/arm/src/armv8-m/arm_svcall.c
+2
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@@ -232,6 +232,7 @@ int arm_svcall(int irq, void *context, void *arg)
regs[REG_PC] = rtcb->xcp.syscall[index].sysreturn;
regs[REG_EXC_RETURN] = rtcb->xcp.syscall[index].excreturn;
regs[REG_CONTROL] = rtcb->xcp.syscall[index].ctrlreturn;
rtcb->xcp.nsyscalls = index;
/* The return value must be in R0-R1. dispatch_syscall()
@@ -427,6 +428,7 @@ int arm_svcall(int irq, void *context, void *arg)
rtcb->xcp.syscall[index].sysreturn = regs[REG_PC];
rtcb->xcp.syscall[index].excreturn = regs[REG_EXC_RETURN];
rtcb->xcp.syscall[index].ctrlreturn = regs[REG_CONTROL];
rtcb->xcp.nsyscalls = index + 1;
regs[REG_PC] = (uint32_t)dispatch_syscall & ~1;