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ARM syscall logic: Clear bit 0 in PC settings. Bit 0 is the thumb mode indication and should not be set in the PC.

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This commit is contained in:
Gregory Nutt
2017-08-30 13:56:03 -06:00
parent 8e6c78f425
commit 9d3b1af1cd
1 changed files with 5 additions and 5 deletions
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arch/arm/src/armv7-m/up_svcall.c
+5 -5
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@@ -294,7 +294,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
* unprivileged mode.
*/
regs[REG_PC] = (uint32_t)USERSPACE->task_startup;
regs[REG_PC] = (uint32_t)USERSPACE->task_startup & ~1;
regs[REG_EXC_RETURN] = EXC_RETURN_UNPRIVTHR;
/* Change the parameter ordering to match the expectation of struct
@@ -326,7 +326,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
* unprivileged mode.
*/
regs[REG_PC] = (uint32_t)USERSPACE->pthread_startup;
regs[REG_PC] = (uint32_t)USERSPACE->pthread_startup & ~1;
regs[REG_EXC_RETURN] = EXC_RETURN_UNPRIVTHR;
/* Change the parameter ordering to match the expectation of struct
@@ -367,7 +367,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
* unprivileged mode.
*/
regs[REG_PC] = (uint32_t)USERSPACE->signal_handler;
regs[REG_PC] = (uint32_t)USERSPACE->signal_handler & ~1;
regs[REG_EXC_RETURN] = EXC_RETURN_UNPRIVTHR;
/* Change the parameter ordering to match the expectation of struct
@@ -405,7 +405,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
DEBUGASSERT(rtcb->xcp.sigreturn != 0);
regs[REG_PC] = rtcb->xcp.sigreturn;
regs[REG_PC] = rtcb->xcp.sigreturn & ~1;
regs[REG_EXC_RETURN] = EXC_RETURN_PRIVTHR;
rtcb->xcp.sigreturn = 0;
}
@@ -439,7 +439,7 @@ int up_svcall(int irq, FAR void *context, FAR void *arg)
rtcb->xcp.syscall[index].excreturn = regs[REG_EXC_RETURN];
rtcb->xcp.nsyscalls = index + 1;
regs[REG_PC] = (uint32_t)dispatch_syscall;
regs[REG_PC] = (uint32_t)dispatch_syscall & ~1;
regs[REG_EXC_RETURN] = EXC_RETURN_PRIVTHR;
/* Offset R0 to account for the reserved values */