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arm: userspace: Do not overwrite r7 during syscall.

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The r7 register is used as a frame pointer on ARM Thumb. As result, it
cannot be modified by the assembly code in functions using stack frame.

This commit replaces r7 by r8, which is a general purpose register.
Also it fixes #7704.

Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
This commit is contained in:
Piotr Zięcik 2018-06-01 08:49:14 +02:00 • committed by Anas Nashif
commit 997a49ade9
3 changed files with 11 additions and 11 deletions
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14
include/arch/arm/arch.h
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@ -369,7 +369,7 @@ static inline u32_t _arch_syscall_invoke6(u32_t arg1, u32_t arg2, u32_t arg3,
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r1), "r" (r2), "r" (r3),
"r" (r4), "r" (r5), "r" (r6)
: "r7", "memory");
: "r8", "memory");
return ret;
}
@ -389,7 +389,7 @@ static inline u32_t _arch_syscall_invoke5(u32_t arg1, u32_t arg2, u32_t arg3,
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r1), "r" (r2), "r" (r3),
"r" (r4), "r" (r6)
: "r7", "memory");
: "r8", "memory");
return ret;
}
@ -408,7 +408,7 @@ static inline u32_t _arch_syscall_invoke4(u32_t arg1, u32_t arg2, u32_t arg3,
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r1), "r" (r2), "r" (r3),
"r" (r6)
: "r7", "memory");
: "r8", "memory");
return ret;
}
@ -425,7 +425,7 @@ static inline u32_t _arch_syscall_invoke3(u32_t arg1, u32_t arg2, u32_t arg3,
: "=r"(ret)
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r1), "r" (r2), "r" (r6)
: "r7", "memory", "r3");
: "r8", "memory", "r3");
return ret;
}
@ -440,7 +440,7 @@ static inline u32_t _arch_syscall_invoke2(u32_t arg1, u32_t arg2, u32_t call_id)
: "=r"(ret)
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r1), "r" (r6)
: "r7", "memory", "r2", "r3");
: "r8", "memory", "r2", "r3");
return ret;
}
@ -454,7 +454,7 @@ static inline u32_t _arch_syscall_invoke1(u32_t arg1, u32_t call_id)
: "=r"(ret)
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r6)
: "r7", "memory", "r1", "r2", "r3");
: "r8", "memory", "r1", "r2", "r3");
return ret;
}
@ -467,7 +467,7 @@ static inline u32_t _arch_syscall_invoke0(u32_t call_id)
: "=r"(ret)
: [svid] "i" (_SVC_CALL_SYSTEM_CALL),
"r" (ret), "r" (r6)
: "r7", "memory", "r1", "r2", "r3");
: "r8", "memory", "r1", "r2", "r3");
return ret;
}